I want to know if the criteria to get the Super Dragon Balls is to be the best fighter in the tournament of power, or the last man standing. Could you please clarify and at the same time link me to the episode number (with timestamp, if possible) where the Grand Priest States who get the Super Dragon Balls as well?
The criteria for the same hasn't been stated clearly. The Grand Priest only stated that the Universe with the Most fighters remaining in the end would be the winner and the Best performing fighter would receive the Super Dragon Balls. Generally, the last man standing would most likely be the best fighter. However, this might not be true considering Freiza who is weaker than Goku and Jiren is still standing.
However, it is most likely that the Super Dragon Balls are going to be given to the last man standing because the other scenarios aren't possible.