Rotnguns
WKR
Great advice here! Especially about the thermals in the morning.OP, people's points about them not wanting to be moving during the day during high-heat are solid. There's one additional point I can make that adds to that in context, which you can leverage: this weekend there's not much of a moon at all. I find that they typically will feed a bit later into the morning when the moon's minimal, and seem to get more feeding done during the full moon and bed back down a bit earlier at that time. I typically don't make too much of a big deal about moon phase, but at the extremes of the cycle there seems to be a slight pattern shift.
Between the heat causing them to stay bedded down a bit longer, and the moon phase being dark this weekend, I'd offer that your best chances will be for you to be overlooking feed or a very well-worn trail as absolutely early in the morning as humanly possible. You want to be in-place before you can see without a flashlight, ideally, absolutely silent, paying attention to wind direction and remembering that thermals are still cooling and will be carrying scent downhill a bit. After the sun comes up, plan on glassing hard until at least 11am - they bed down twice, and will generally get up to move to second-bed between 930am and 1030am, so keep your eyes peeled.
All that said, with mule deer, everything I pointed out in the second paragraph is generally an excellent approach regardless of heat or moon phase.
Good luck this weekend!