Legislators are supposed to review this and revoke it (and impeach him for abuse of powers), but Republicans are capitulating, ergo nothing can be done until someone with standing sues and it reaches the Supreme Court.
Then we have to assume they will rule it is unconstitutional, despite half of them being installed by him, and that he will listen to them.
https://constitutioncenter.org/blog/how-congress-delegates-i...
I'd recommend some reading. Congress delegated a massive amount of discretion to the Executive over the years on this particular topic.
And it's not just tariffs, he's abusing this for a dearth of other topics. Want to cut down national forests? Nation lumber emergency. Want to mass deport people to an El Salvador prison without due process? National emergency.
Hell, sunset dates'd be nice too.