Talked with my son's about this.
All the deer we've killed since the oldest started coming 14 years ago, have been 10-11 am.
Wild, because in my head I'd say first light is killing hour.
Not sure I've ever killed a deer late afternoon,.
I have to agree with Eelgrass.......if it rains - spend all day at it.If it's hot and dry, blacktails are usually bedded by daybreak. (opening day excepted). Between 11am and 2pm is a good time to catch them moving. A great time to take a ride and do a little road hunting. The last hour before dark can be good too, but to answer the question most of my bucks came from a noon drive about. I'm not proud. Whatever works.
If it rains go and stay out from daylight to dark.