Assume that it froze for the distribution of prizes. But it still continues until reset for next Tournament.
If you restart your JWA App, you should see the message under Social tab that Tournament has ended.
Like mentioned by Kwaack above, I too believe the leaderboard would continue where it is now till the next tourney reset. This is required to be able to continue with the daily battles and match correct trophies opponents against each other.
Might be the new 1.4 will get in some change based on the new daily incubator.