There are several lots like that near the Fremont delivery center. Literally thousands of cars waiting to be delivered around the country. But the day I took delivery of my Model 3, from the Fremont delivery center, there was activity like I've never seen at _any_ car dealer. All the pricing, trade-in valuation, etc was done on-line prior to the reservation at the delivery center. There were dozens of couples waiting around for their turn with the delivery specialists. Hand over the cash, give them title/keys to the trade in, sign a few pieces of paperwork, and you are done. They give you some basic training on the car and away you go. I bet they moved 200-300 cars that one day from that one delivery center.
After owning the Volt for three years, and getting a really long tour of a very early (two digit VIN) TM3 by my neighbor many months ago, I didn't have many questions for the delivery guy. Mainly just getting the phones bluetooth synched, and a reminder on how to put it in "Santa" mode. "More cowbell/rainbow road" had to wait until EAP finished calibrating itself a few 10s of miles later.