I ordered March 31st 2021, White LR, Cream, 20", 6-seat. EDD went from June->October->Blank (for 2 months) -> January (this week)
I just inquired with my tesla sales guy about the january date and how other people who didn't order 6 seaters were getting promised deliveries before the end of the year. He responded with this.
"Please ignore the website estimated delivery window. They change often and only provide very limited info based on production schedule. I checked and your Model X is already in the building queue with ETA out of factory early December. As last email we just started the delivery for Model X very recently for people who ordered way back in 2020, based on the current pacing I don't see any delay for your order."