Eth2 with PoS is already running with Phase 0 on mainnnet though.

https://beaconcha.in/

The merge from Eth1 to Eth2 is expected to happen this year or after. There shouldn’t be any significant delays now because Phase 0 was the biggest hurdle with research and technical dependencies that didn’t exist yet, like BLS signatures.

There’s no way Bitcoin will move to PoS without another contentious fork.