Predicting sunrise spots isn't an exact science. All you need to screw up the morning in the eastern Sierras are some heavy clouds over on the east side of the Mono basin/Owens Valley. So,... I wouldn't base my whole day on it. Glacier Point is the quickest area to get to from your direction. If you are thinking of Ohmstead Point, go out to the south side of the point and look back east across Tenaya Lake. There is also a nice spot on the west shore of Tenaya Lake if you get a good sunrise.
Many of the more scenic shots in the High Country, that don't require a few hours of hiking, are best looking west with the morning sun at your back (Cathedral Peak, Unicorn, Ohmstead Point, May Lake, etc.) If you do opt for Glacier/Washburn Point for sunrise and it turns out to be a bust, you are only about an hour and a half from the Tioga high country... time enough to have the sun on the mountain peaks up there.
Regardless of how sunrise treats you, you are bound to have a good time anyway.