P.S this is the only time i knew that USDT is an ERC-20 token. FOR REAL!
Yes according to MEW support they support USDT ERC20 just make sure to add this as another custom token.
Read this post: https://www.reddit.com/r/MyEtherWallet/comments/c8wv07/how_to_store_erc20_version_of_tether_usdt_on_mew/
USDT ERC20 token is different from real USDT which is coin don't compare them they are different if you send the USDT coin to MEW it won't work except for USDT ERC20 token.