It all depends of his next move, but he has a clear draw here, line may go as follows : 54.Rxd6 Kxd6, 55.Kh6 Ke6(so u can guard f7 square when knight arrives there), 56.Kg7 Nf7, or even better is 56. Kg7 b5, (he cannot take the knight because 57.Kxh8 Kf7, 58.a4(forced) bxa4 and you are winning),but again 57.Kf8 Kf6 and its a draw because both kings will just stay near f7 field and move back and forth, but he needed to find all of this in a few seconds.
And congratulations, it was a nice game
Cheers
Here's a game where I was black and played the latvian gambit. Great tactics by and well here you go. I won on time but I think I had a sure win. Reminder it was a 3/0 game.