Each running tournament on the tournaments page shows "Running (NN%)" which is meant to give us an idea of how far along the tournament is and how close it is to completion. It seems to use the % of total turns taken throughout all games in the current round of the tournament. While that's an interesting statistic, a more useful statistic would be how far along the slowest game is.
Because what I've noticed is that the total % will ramp up to 90% pretty quickly but stall in the 90s for quite some time while the stragglers finish up their games. If this summary showed slowest % instead, then it would be far more linear and predictable and give us a better idea of how far along the tournament really is.