Delay of AWD, white, 19' wheel is most likely to be related Tesla's batch scheduling since we all know that Tesla just produce all Model 3 in batches now, and then match the cars to orders on hands. Not exactly sure how their batch production works, but if we assume they produce 1 config per day, it will take 70 days to rotato all available configurations (RWD: 7 colors x 2 wheels, AWD: 7 colors x 2 wheels x 2 interiror, P3D 7 colors x 2 options (with or without Performance Upgrade) x2 interiors. )
On the bright side, it seems that time from VIN assigned to delivery is very short for Model 3 because of batch productions. I had to wait for 2 months to get my MX after receiving the VIN, since they assigned the VIN before starting the production.