The 20% tariff from Vietnam has been announced by Trump, but unless I’ve missed something in the past week or so, it’s not official. There was a news piece I read a few days after he announced the 20% number that said the Vietnamese side had actually agreed to 11% and were surprised when he injected himself into the process at the end and announced a different number. So it sounds like it’s a WIP. I believe the only country that actually has a signed deal at this point is the UK.
That being said, the copper, steel, and aluminum tariffs announced recently are real and have been assigned import classification codes by US Customs (which is when new tariffs to become real).
The import tariff from Vietnam is 20% and Thailand is 19%.