I believe this from the White House contains the only semi official numbers:
https://www.whitehouse.gov/fact-sheets/2025/04/fact-sheet-pr....
That has 10% across the board starting April 5th, then unspecified rates for the “worst offenders” starting April 9th.
I say “semi official” because it’s not official until US Customs and Border Patrol publishes the rates. So far I don’t think they’ve done that. Their announcements page here doesn’t have anything:
Yes Trump has a history of announcing shocks and then quietly back-peddling etc. But the numbers come from the big placard he holds up. There are pics of his announcement holding his rate card in article if you scroll down.