Thanks - when PoW is done, is that only for Ethereum or is it also for all the other coins on that network?
Are you talking about the tokens on the ethereum network like USDC or USDT or other ERC 20 Tokens or are you talking about other POW coins like Litecoin and Dogecoin and Monero?
Because when ETH goes POS you won't be able to mine ETH at all, so the fees from people doing ERC20 transactions will go to the POS. And you can't mine ERC20 coins, not possible.
But you can still mine other coins like Litecoin or Dogecoin or Monero and you can even mine ETC which uses the same algo (pretty much) as ETH.