Tusker House closed at 5:00 pm earlier this month when we were there.
For a week though the Time Guide said it closed at 5:30 so we went there at 5:15 to eat and it was already closed. We were hungary and annoyed that it closed before the time guide said, so we talked to a manager that had conflicting stories that either equipment was hard to keep going or the Time Guide was printed wrong. She stood by the guide was wrong and she had tried to keep open late but couldn't. Well that was the beginning of the week so the Time Guide said 5:30 for the whole week when it was really closing at 5:00. So don't trus the time guides but actually check the restaurant the day you plan on eating there.
For EMH nights I think the restarants might change that stay open later, but I think Flame Tree and Pizzafari stayed open later for us the night we did it (but not till park closing).