I spoke to a delivery person at my local service center today. Beforehand, I could never get a person on the phone, but I tried again today and someone picked up!
I asked my question to her and she said you will see the car, accept delivery and sign some papers and be out in 5-10 minutes. I mentioned some youtubers show the delivery appointment as being walked-through the car, helping you set up your driver profile, etc. She said they don't do that now because they are very busy with deliveries right now. She said if you have questions, you can ask, but depending on how much time it requires, you may have to wait or schedule an appointment.
I also asked about defects, I said I read a lot of posts saying their cars have defects and not accepting delivery. She said they check the cars after they are made and once they arrive at the service center. She said cars that were made toward the end of last year had a lot of defects because they were rushing them out. She said the cars she has been seeing lately look really good. The car I was supposed to take delivery March 16-19 was sent back because the door wouldn't open/close properly, but at least they checked it before I went to pick it up.
She finished by saying they are now moving much smoother than before.