Growth rate and size vary from animal to animal, I've seen bp males in the 3000 gram range. All the depends on willingness to eat, size and frequency of feeding. At his size a little pressure like if you were going to pop might expel "sperm plug" (hemipenal shed) which might confirm male although the absence of it does not necessary confirm female. Your best bet is to have it sexed by an experience breeder or a vet.