Based on the raw epidemiology data on omicron over the past 2 weeks and the current numbers in the US and the likelihood of an omicron-delta hybrid, if you don't already have any kn95 masks, buy them while you can. If you wait until Monday (or even tomorrow) you're going to find stock low or non-existent or price gouged due to supply chain issues with increased demand. Especially since NYC has promised to provide free tests and kn95 masks but haven't yet allocated enough kn95 masks to distribute to their population. They have 1 million and NYC has 8.6 million people living there. So yeah, 1 per 8 people and distributed "to the communities" whatever that means for distribution.... I'm following my own advice, just bought another box of them for myself from Amazon on Weds right after I got back in town. (I'm down to one disposable kn95 remaining to get me through until the ones I order arrive.) We are basically at a point where even shopping or running errands shouldn't be done without a kn95. And don't attend parties or concerts or events without a mask. And if you've allowed yourself to eat/drink indoor at restaurants/bars, try to return yourself back to carry out whenever possible.... Otherwise you will get at least a mild case of omicron.
I'm not trying to be alarmist. I'm just looking at the available data on omicron as it becomes available.
Basically, omicron is pretty close to a worst case scenario from an infectious disease perspective. It replicates in the bronchials instead of the lungs, it lasts in the air for 16+ hours, a significantly smaller quantity of pathogen will get you sick, it evades the vax including if you already got your booster so you are likely to spread it even if you have a "mild" case due to the booster (and if you didn't do that back when I recommended it in November, you're probably sol to get it before next year, especially in areas with rising case counts), it incubates/replicates fast and is easily spread several days before you test positive, hospitalizations happen sooner to getting your positive test (about 6 days instead of 10) which will increase icu bed usage, AND it's putting greater numbers of kids in hospital (meaning that if you have kids too young to get vaxxed you REALLY need to take personal responsibility and not be taking them to crowded events or on airplanes and be as cautious with yourself as a vector of potential infection as if you were immunocompromised.) I truly believe that the reason they are saying there "likely" won't be an omicron specific booster is because they want to make sure as many people as possible get boosters NOW (and you should -- an omicron lineage vax won't be likely until March or so and by then you'll be needing another booster, tbh. Vaccines for rhinoviruses and coronaviruses are typically a 4-6 month efficacy due to high mutation rates.)
Also, exponential numbers and rapid spread combined with winter meaning most social settings are indoors means that this is going to be a redux of the early waves in 2020 with hospitals getting overwhelmed. Be cautious and don't do anything that might land you in need of medical attention because you likely won't get it -- especially because many of the nations hospitals were already running at near max capacity even before omicron surge.
There's a possibility of omicron burning itself out hot and fast, but that's not what the data or what I'm foreseeing leads me to believe. It's technically possible, but at this time the data doesn't support that conclusion -- and if you assume it while we wait on data then you could really get fucked up by the spread under that assumption. I'd recommend getting yourself some kn95s during the period of time you can and being somewhere you can hermit with as little contact with other people as possible.
I told my sister there was a short window for me visiting her between Thanksgiving and Christmas and that after that I didn't see anything until April/May. I will likely be out there again in mid April. I'd like to have another visit before the new baby arrives in mid-June so I can spend time with my current neblings Jack and Monroe split just between the two of them instead of trying to split my time/energy three ways. (My sister has told my mother and some other people now, so it's no longer something for me to keep to myself. I knew because of the timing while I was there 9I've actually visited every time my sister was about 3 months pregnant and so I've always known before she told anyone else) so I couldn't miss the fact they weren't drinking during my visit the way they typically do. (Jon chooses to go dry while my sister can't drink in support of her) and that her vitamins were prenatal vitamins. She told me right away the first night because as she and my brother-in-law had discussed and told the kids, "Aunt Dani will notice but be too polite to ask. She'll leave it for us to tell her, but she'll observe and know. So we may as well tell her and ask her to promise not to tell anyone else until we start telling people." Which is true about me. I observe everything and draw my own conclusions, but I don't out people if they're not ready to tell me or talk about things yet.)
But if you're not paying attention to omicron yet, wake up, pay attention, and be extremely cautious and concerned. Also order kn95 masks while you can if you need more of them. Only wear your cloth masks over a kn95. Look at the data yourself or just trust me. But this is all the warning I'll give. And honestly, we're at the tail end of the window for acquiring more kn95 masks at reasonable prices.