Probably the easiest time I've had calling in good toms have been after
10:00. If your lucky enough to locate one that will respond to calling then
you better get ready because he will probably come in quick. Crow calling
to locate birds after morning works well. Sneeking around glassing open fields as far out ahead of you as possible hopefully will allow you to see them before they see you, which in my neck of MO is sometimes hard to do.