Not sure if it's entirely normal, but mine looks the same. Nothing structural on the top, it's just holding the tile in place, then your coping is going to be mortared in, should be fine. My pipes also have some of those cracks. Again, the plaster should fix that issue... I had to reinforce with my plaster company that I am expecting them to seal around all of the pipes. If the pool leaks, I don't want people pointing the finger at one another, 1 sub is responsible for making sure it doesn't leak, that's the plaster sub in my opinion.