Can I move to flower??

Hey guys I planted these November 20th and I know it’s just been a little over 6 weeks but to me they almost seem like they’re close to just go into flower? I’m running HLG 600 rspecs, in coco, Mills nutrients and recharge for a time to time beneficial. A pic is posted below please lemme know what you guys think and offer any tips! Thank you and happy new year to all!

The plants look great, I can’t tell from the photo if the nodes are opposite or alternate, but normally a photo is “sexually mature” when the nodes go from opposite to alternating, that’s about the optimum time to flip, that said, if you’ve got enough room (account for stretch) , then you could let them go longer for more yield.