Usually during the first week of November you'll see, on average, 2-3 shooter bucks per hunt. Most of them are in the 150-160" range, but you should see a couple180's if the weather is right. If you play your cards (and the wind) right, you might be able to get a glimpse of a 200"er, but don't be too quiet or the Yeti might mistake you for prey and it's lights out for Mr. Jim Shorts, if you know what I mean.
PS - Depending on where you're hunting and what type of weather we have you should see a few decent bucks during your stay, but as with anything in the hunting world there's no guarantees. There's plenty of big deer in IL, but they're no easier to kill than they are anywhere else.