I have (had) a March/April delivery for my black interior R1S. It being April 29th and not starting my 8-step program indicates not getting my delivery in the next 36 hours.
To make it official, my guide reached out and said R1S people will get a "newly updated delivery estimate" soon. Really...
I received this email a little after noon Pacific time.
Titled "Your guide is on the way"
Good news! Next week, your Rivian Account Page will reflect your pre-March 1, 2022 preorder pricing. Going forward, your Account Page will be the best place to get the latest, most accurate information...