Welcome and congrats! I ordered mine in June of '23 and got it in December, so your wait is not bad! I too went from a 1500. Although I used it like it was the HD I really needed/wanted. Went with 3500 AT4 gasser this time. I have had a couple GM diesels over the years and they are badass, but for my use and requirements, the 3500 gasser made more sense. Anyway, I was nice to her for the first 500, but now at 16k, used and abused! I own/operate a roofing Co and this is my work truck. I absolutely love this motor, especially after installing an intake, cutting out the stock muffler, and installing a big body Magnaflow. All for sound as I know minimal gains (if any) but needed something to remind me I'm driving a truck. Also did a banks Pedal Monster/idash. I recommend it. I average 10-11 rural/back roads and 17 is my best on highway, unloaded. I saw 6 mpg the other day while towing 16k dump trailer. It's a brick so doesn't help.
Anyway, you'll enjoy the hell out of the new truck. I still am!