I've taken delivery from Rockville of both my 2018 M3P and just last month of my 2022 MYP - Rockville is fine, the location is kinda shitty but it's a service center not a showroom. Both vehicle deliveries occurred during a huge glut of deliveries so don't expect any pomp or circumstance. I took delivery of my 2022 MYP last month in about 10 minutes flat. You show up, car's out front, your name card on dash, go inside, sign 3 papers and boom your gone.
The speedy pickup worked great for me because I was a Tesla owner. I feel bad for those who have never owned one before, when I took delivery of my 2018 M3P they at least had a "volunteer" walking you through the new vehicle which was pretty nice.
Not sure how deliveries work at Owings Mills these days.