We were watching the online tracking for the car and before we knew it we noticed it was done! The car finished either 4/2 (Saturday) or 4/3 (Sunday). We aren't sure exactly. The status on 4/4 was "Production Ends". It was at "Finishing Touches" for a few days, then "At Your BMW Dealer" which is PCD in our case. Performance Center Delivery is scheduled for 4/20 and we could not be happier!
Incidentally, we did try to make another change to the order but it was rejected because production was fully scheduled. That was on or about 3/28. So be aware, about a week or 2 before production actually starts, you are "locked in".