Looking at the sticky-post delivery spreadsheet in this forum, one can sort by any column--including VIN date. From September 2019 backwards, it looks like there are multiple VINs assigned every day in a fairly steady progression.
However, there have only been two VINs assigned in all of October so far--both from people who had quite long waits to get that far.
Being a new-and-upcoming-owner I'm naturally anxious about my own order, which appears to be part of this early-October lull. T is... um... still making cars, right?
I ordered my 3 on Oct 25 and I'm taking delivery Nov 16. First batch of 2020s, apparently. I felt it was very quick.