I would wait. Why do it twice? Let it finish its growth spurt. Looks like a nice healthy tree to me. I guess you'd want to keep 3 of the strongest leaders for fruit production. Is that how it works? I think pruning in Winter is better for the tree - less pathogens around to invade freshly opened wounds.

Prune them now, summer prune for fruit, winter for shape.
Cut the ones you do not want to train back to a couple of leaves from where last years wood
This will generate fruiting buds
You may get slight regrowth, just cut that back to one bud later in Autumn

I pruned my apples & pear only a week or so back, training mine as sort of cordon

Thanks, mine are free-standing so it's just keeping their height down & tidying really. & being patient with young trees of course... Fingers crossed for fruit next year