If you can gain any elevation do so to look about. A decade ago i watched a big buck bed down in a divot in a recently cut wheat field. He wasn't in a high point, but a low point. The does were almost always bedded in the brushy edges of the fields, not off in the trees even though there were plenty of trees.
You'll get a big whitetail to bed down in what looks like one tumbleweed and a few blades of tall grass. They are crazy able to bed in a tiny patch of brush. Be ready to shoot like they're birds because they'll also sit right down and let you walk within a very short distance of them if they don't have cover to escape by. And they're not mule deer, they aren't going to turn back and give you a second look, they'll run like hell till out of site.
Try to find ways to glass the brushy edges of the fields without walking them down. In my trips to that country the trees were where they took off to after you pushed them, they weren't bedding there until they were worked. even if you are the only guy with permission, you are likely not the only guy who'll be there. You may end up having to hunt them up like pheasants, minus the dog. First couple days you could see a groups come running through at any time as they get pushed around from neighboring property, I wouldn't take any mid day time off early in the season.