I think we're still really early, actually. I have a DEC 2019 pre-order and just got my confirmation/guide yesterday afternoon (but not the 8 steps). I know there are other local people who pre-orders after mine that have already taken delivery. So, I wouldn't put too much stock right now in pre-order date as an indication of ramp. From comparing multiple forums (plus facebook) it looks like yesterday was a big wave of confirmations and it's the first "bulk" group I've seen so far.
Saw an October 2020 on another thread. He was scared to say lol.. but I’m sure he never touched his config and just rode it out. Not like me with 93 times..
Seems like config - BM and underbody- got made in the first R1S batch? Don’t recall any people without those options getting delivery yet, and very few guide contacts for non-underbody or non-BM.