There aren't many attractions in that area that you could do in less than 45 minutes. If you run straight there you might be able to do the safari, but I have a feeling you would likely be late for your breakfast and you may lose your reservation. I would take my time and look at the animal exhibits near the entrance and around the tree of life. I would also grab fastpasses for the safari ride right before breakfast since the ride is right next to the restaurant, that way your fastpasses should be available to use right after you are done eating.