I ordered mid-April of 22 and picked up mid-August of 22. AT4 3.0. I was very pleased with the order turn around time and it seems like it's only improved since then.
Picked mine up Aug 24, ordered Apr 15. Not a bad wait at all in the grand scheme of things. My first GMC in 10 years and my first diesel ever. Loving this truck!
I live in Northeast Arkansas which is serious farm country so that might explain why there are so many in my area. In a recent dealer search I came up with about 10 brand new 6.2s within about an hour drive. SLE/LT as well as SLT/LTZ and with both rear end options.