Turkeys are typically untypical...as you read this understand that with a turkey it could be 100% correct, 100% incorrect, 50% either way, or even 75-25 either way because they can be crazy animals.
But, they like to roost over creeks, rivers, and swamps. In these areas, it appears they usually roost on top or near the top of the ridge. When I find a gobbler at daylight in hilly/mountain areas, I sit on top of the ridge above him because I think they usually pitch down up the ridge rather than below. Soon as I say that though they do opposite. Also easier to call them up hill than down. Typically......
I've never really noticed them preferring one species of tree over the other. Seems to me it's more related to terrain, immediately around them and/or proximity to a cow pasture, food plot, or other open area for feeding. Also, not many grasshoppers out yet, so their diet will still be mainly some vegetation, left over red oak acorns (I've killed a few with germinated red oaks in their crop), and bugs under the leaves.
Hard to say if they will be there on opening weekend. They very well could be, but just as likely they could be gone. I'd venture to say that if you found some turkeys, they wouldn't be far from there opening week.