Ford is supposed to put the model configurators online by September with customer orders to be placed starting in December for deliveries starting in "mid 2021." Was originally to be spring 2021. It has been reported that Ford has enough reservations that those without them won't see Broncos now until 2022.
Rivian has moved their delivery date back a few times and right now they are saying delivery of the R1T begins in June 21 and the R1S in August.