I did a ton of research by talking to multiple dealers, scouring websites, watching Youtube clips, and even asking a co-worker's cousin who works at one of the GM factories in Michigan to gather up what info I could. I would just stress that the list is, at best, a fairly educated guess. I think it's important to note the caveat I put in my original post which was supplier shortages, Covid, war, inflation, etc. are all factors that could affect any of these timelines. Nothing is guaranteed.
Covid, for example, is affecting many Chinese suppliers.
War is affecting Xenon gas production in the Ukraine, which supplies some 60-70% of the world's supply needed for lasers that engrave chips.
There was an earthquake in Japan a few weeks ago that temporarily shut down two chip manufacturers. Coincidentally, I asked my local Toyota dealership how many Sequoias they thought they would get and they said, "Probably 1, maybe zero at this point. And don't even ask about the bZ4X."
One interesting tidbit from the YAA stream either yesterday or the day before: they indicated they heard rumblings that various manufacturers are shutting down 2022 production and saving up what they've got for fully-featured 2023 production. This is great news, if true, but until we hear confirmation I wouldn't be on it.
So in summary: let's keep our fingers crossed for a best-case scenario. I think the most important thing is talk to your dealer and hope they communicate! Hopefully you've got a good one - I'm fortunate in that two I've spoken to the most are on the up-and-up, share info, and have no markups, no forced trade-in, no forced GM financing, etc.