We had the exact same ADR time when we went in December. We arrived at the restaurant before 830 and were seated right around 830. So, I would definitely try to get in early - maybe you could get in earlier than we did. That being said, we wish we had gone out to grab Fast Passes. By the time we finished (around 915) and got moving (we had one person have to go get her electronic wheel chair which took forever) the ride wait time was already 15-20 minutes. We really didn't wait too long for a safari "bus" but the time included the long walk back to where you load onto the ride vehicle. I think with the walk back we "waited" 15 minutes or so. The actual wait at the loading area was minimal (maybe 5 minutes).
Have a great trip. This was our favorite character breakfast!