You’re the man!

You're the man!

Used as a vague expression of congratulations or to boost the listener's self-confidence. A: "I got accepted to Harvard!" B: "Wow, congratulations! You're the man!" I just heard that you landed the Jefferson account! Who's the man? You're the man!
Farlex Dictionary of Idioms.

You(’re) the man!

and YTM
exclam. & comp. abb. Congratulations!; You’ve completed the task successfully. (Now often You da man!) Good job, Fred. You the man.
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • You're the man!
  • You the man!
  • YTM
  • way to go!
  • keep (one) posted
  • keep posted
  • keep somebody posted
  • keep someone posted
  • hats off (to someone)
  • hats off to