Sexually mature plants alternate but in no way it means it will flower.
He is still a few weeks out on veg before that happens , he flipped early and was wondering if it’s a male or female.
Atm it’s hard to say as the bracts are (opposite) the stipules haven’t developed yet. On autos I’ve seen them go into flower without the alternate branching and standard (sativa- indica) reach maturity without switching the branches unless flipped and even then just the top 2-3 alternate but all clones will start out alternate as it’s “mature” to begin with hence my comments to the subject