Just chatted with CeCe of Rivian. The time estimates are NOT on rivian.com yet. There is no ETA on the ETAs (LOL!). So don't go looking for your personal ETA yet. Sigh.
Yeah, I think you should, like, cancel your R1S. In fact, everybody in line ahead of me should immediately cancel your orders for your R1Ss.
(Hey, you can't blame me for trying. :) )