I like to have my stands in and have shooting lanes trimmed ATLEAST 2 weeks before opening day.
You should have time to scout your spots. I like to scout all year long. Whether I'm coyote hunting in late winter, spring turkey hunting, trout,walleye,bass,musky fishing, fall turkey hunting, summer/fall mushroom hunting. I always have deer movement in mind!
It's likely that if they're there now then they'll be there when season starts. What do deer have in mind (when not in the rut), food, cover, wind, visibility, escape routes, water.
You should also keep tree foliage in mind, so that when the leaves drop you're not sticking out like a sore thumb.
Hope this helps. Also if you put where you hunt (state) in your profile, then you'll get more detailed answers because different parts of the country call for different tactics. Such as, if you're in the dry parts of the U.S. you'd probably focus more on setting up near water.
Good luck!