Ita hard to comment on pics with HPS lighting, cause the color is all off. They look healthy, no sign of burn. @ 2 weeks into flower you should be able to tell sex pretty soon - at 2 weeks mine generally all have the bud set formed.

What strain are they, what type of system and what /how often are you feeding them? Type meaning E&F,NFT, DWC, SWC, Bubbler, etc etc?