If I was going to book a guide trip I wouldn't do it this time of year. That being said, if I had to I would want to be out as early as possible as it's cooler, minimal recreational boat traffic and I just like fishing early, my favorite part of the day.
As far as fish catching, it's a tough time of year, all I would expect from a guide is to give me his best shot at catching some.
Bass fishing to me is partly about catching them on artificial baits, so I would not want to fish crawlers. If I'm going to break out the bait, I'd rather just fish for bream or crappie. I think a guide trip for some bull gills would be fun this time of year, I think I would just as soon do that then fish for bass right now.