I bought my '22 Avenir in April and the only retrofit I need is the 2nd row heated seats and my front parking sensors. A local dealer in SWFL got them in and I'm going in on 1/28 for them. I did not buy my Avenir here, but I was placed on a list to be called.
From my understanding they're slowly all coming in. Not all dealers are getting the chips at the same time. Some dealerships have priority over others due to volume of sales. My closest Buick dealership is trash and only has 1 dealership. The one I am going to for the retrofit has about 25+ dealerships in Florida, though not all are GM lines, maybe 12 are. Now I could very well be wrong. I'm just going off what the dealership I bought mine from said back in April and what the dealership I am going to told my husband. (I bought it at neither Buick dealers close to me, I drove over an 1.5 hrs away as I love that dealership.)
I would call around to other dealerships if you have any closer to you. At best, you get the chip or maybe more information regarding the chip. Patience is going to be the key though.