Is this the thread you're talking about? It's stickied in this section. It should tell you everything you need to know and more. I think in my experience, I received my M2 within 6 weeks of my build date. This was to the east coast and I think it's a little longer for the west coast.
https://f87.bimmerpost.com/forums/sh....php?t=1225876
Hope this helps