Another update! Just spoke with my DC to confirm delivery and update my financing terms since it was expired. My terms went from 2.44% down to 2.14%!! Same principal amount as well (about 40% down). They said they were super excited since this is the first 2021 M3 performance they've gotten. They said it'll be cleaned up for tomorrow and even dusty it looks beautiful. They also said I can swing by early to check the car. The last M3P they received was over 4 months ago.
For my DC at least, they asked if I wanted it delivered to my home since I'm within 30mi of the center, but I said I would just go in anyway (in case I find anything that the service center could fix). It's also the reason why I moved my appointment from 5PM to 12PM, since the service center would still be open.
It seems like the last four months of agony may finally pay off with all this good news. I hope. Praying that the car is perfect.