I assume that Fremont will remain unchanged for quite a while. Fremont ramped slowly. Shanghai ramped more quickly because Tesla learned from Fremont. But it still took them two years at Shanghai to go from 183 daily to 2,000 daily. If that's the reality for Austin and Berlin, then it'll be a while before they can even put a dent in the demand for Model Ys. I don't think anyone with an order in for a Model 3 should expect acceleration. There are a lot of people waiting on Model Ys, and that's the higher margin vehicle.I would think Fremont would still produce some Ys, at least until Texas is running at full capacity. The Y is also the more popular model of the two (crossover things) so they’ll want all the capacity they can get to build more Ys.
For those interested in production rates and such, I encourage you to watch Rob Maurer's Tesla Daily channel. This particular video goes through the latest production numbers.