I just booked Yak and Yeti for 4:45 which I was told was the latest booking for that day. The park closes at 5 so I assume we can have a relaxed dinner because there will be no one waiting for a table. It is a bit early but I really wanted to try there.
Tusker house dinner hours vary (at least they did last month), some days had lunch only. Some days it was open until park closing, other days it closed an hour before park closing. I would imagine the when you make your ADRs they would know what the closing time is.