VIN# generated basically means your vehicle has an identify now. It exists in the ether of vehicles in United States (although its not physically build yet and does not actually exist).
You can use the VIN# to track the built and production by talking to Jeep Chat on the website. Once the vehicle is scheduled to be build (D1 status), you can go on the following website but plug your vin at the end of the link and get the full build specs. Later once the car is released from final quality, you can use the vin# again to get the window sticker. I have the link for the window sticker below also.
Build Sheet:
https://www.jeep.com/webselfservice/BuildSheetServlet?vin=1C4RJKEG7M81XXXXX
Window Sticker:
https://www.jeep.com/hostd/windowsticker/getWindowStickerPdf.do?vin=1C4RJKEG7M81XXXXX
(replace the 5 X's at the end with your actual VIN last 5 digits)
Basically, if your Build Sheet shows up, your car has actually started manufacturing. If your window sticker shows up, your car has most likely cleared final inspection and is ready to be shipped out.
Hope this helps!