it’s not over till it’s over

[ its not oh-ver til its oh-ver ]

idiom

1. Informal, it ain't over till it's over. the outcome is not certain until the process is completely finished:

   The game is tied with only 9 seconds to go, but it’s not over till it’s over—we could still win!

   I’m pretty sure we have the votes to get this bill through the Senate, but it’s not over till it’s over.

Word History and Origins

Origin of it’s not over till it’s over¹

First recorded in 1973; attributed to Lawrence Peter “Yogi” Berra ( def )