We've already known PoS is more efficient for like a decade haven't we? When will it become real and actually start to supplant Bitcoin, 2030? It's a very interesting theoretical point but I don't see how it's relevant when we're talking about the environmental impact Bitcoin has been having for years while Tesla is dumping money into it.
Ethereum 2.0 (proof of stake) is currently a hybrid, with the beacon chain operating in conjunction with Ethereum 1.0 (proof of work).
The plan[3] is to merge Eth1 and Eth2 by 2022, though it's an admittedly ambitious plan. My bet is that it will happen before 2024.