They are definitely building batches of Blue Model Ys now. We drove next to the delivery lot for Fremont, and saw tons of Blue Model Ys.
Happy update for me; I'm getting the car tomorrow.
I went to the showroom today and spoke with a salesperson and a delivery manager. Be pleasant and kind throughout, while making your case. Remember that they are people working a frustrating job, and many things are out of their control.
By checking in in-person, and being patient, we got them to offer to check the status of our Model Y. They found that it was pretty much ready except for the detailing, but the detailing team had just gone home for the day. The manager then slotted us in for tomorrow and prioritized our car. They also resolved a few weird quirks with our account ("Strange, there's a bunch of contradictory notes here..."). We saw the changes on our end shortly, and now we're scheduled for tomorrow.
I get that these are expensive cars, and it can be frustrating to not get it when promised. We had to rent a car this weekend because they missed their own dates, and communicated poorly. Even the largest and most efficient companies are run by people, and mistakes happen. Be kind, be understanding, and be firm. This will get you a long way.