I called VW Credit today. For California, there's no waiting period. I could start the buy out process as soon as the account is created on the website. However, VW will not able to send the title until they received it from DMV, and this could be 60-90 days.
Another thing that I got through the rep was, no interest will be refunded for leases. I am surprised to hear that. She basically said that there's no benefit on paying the lease early and buy out, as VW Credit will not refund any interest.
There are many different data points so far. Some said tax will be prorated and refunded, now this VW rep is saying no.
My plan is to lease and get the tax credit, as my tax situation will not allow me to claim 2023 EV tax credit. So, the best course of action for me is to put a substantial down payment, like a one-pay. Then the tax on the lease monthly payments will be a lot smaller, while able to get the $7500 lease credit now.