It has been 6 months. This is a CNS nerve, so you'd usually expect to see something in 3-6 months. CNS nerves are much less likely to heal, and it was 3 months between the eye being removed and the transplant.
IMO it seems unlikely that there will be any restoration of vision, but having an eye at all is an absolutely incredible accomplishment surgically. All those tiny things being attached inside the skull is just amazing.