It means you should be getting the vehicle very soon.My build sheet is available today. Does that mean it's built? The ship date is today according to the dealer.
Timeline for those who are wondering:
Ordered 8/30
Received Vin 9/3
D1 Status 10/3
Build Sheet available 11/17
Your window sticker will probably show up 1-2 days after you have the build sheet.
Ask your dealer for the current status code so you can confirm if it shipped already.