strech

Those look great. Most ppl don’t want them to stretch in veg. You want tighter nodes so when you do flower - the buds will be closer together and grow into one another. Also it will make your light more effective when your plants aren’t super tall and stretched out between buds. When they are stretched far the light isn’t as strong down low on the lower buds. If that’s all the space you have there in that tent - I’d flip to 12/12 soon cuz they are going to increase in size for sure. Either way, they look plenty mature to flip. But if you have more space - and want bigger yield - you could wait another couple weeks.