Odds of anything going right at IAH today?

All the delayed flights set to go out after airport reopening just have round estimated times (11, 11:15, 11:30, etc) — it’s not giving a ton of confidence that they’ll actually arrive at destination cities in time to make layovers.

Do we think it’s reasonable to assume these delays are relatively accurate, or are they underestimated? I’ve never flown through a completely closed airport that’s reopening before.