I have watched the first 92 episodes of Dragon Ball Super. At the start of Episode 78, the Grand Priest explains to Goku and Beerus that the best fighter will receive Super Dragon Balls. But at the end of the episode, the Grand Priest does not explain the best fighter reward to other universes. Instead, he announces that low-level mortal level universes will be erased upon losing.
Does the Grand Priest explain the best fighter prize after Episode 92? I don't care about spoilers now because my brother says "You didn't watch DBS properly, the Grand Priest mentioned the prize for winning the tournament many times". But I disagreed on that.