'Ohana - Question re 8PM reservation Memorial Day weekend

[GeorgiaHoo]

We have an 8PM Sunday dinner reservation at 'Ohana. Will be at Animal Kingdom during the day then heading to 'Ohana for dinner. Never eaten there before and wondering how early before our reservation we should arrive and what time can we expect to be done. Heading over to MK after dinner for EMH (park open till 1AM).

Thanks in advance