Ready to flower?

So many plants I will say one - two more weeks and switch, the longer you wait the double the work will become when they start to flower they will grow around + 50% of what they are now

judging by the space in the pictures, not much longer. you'll have 4 weeks of strong vege growth after flip to 12/12. then, it'll taper off. The exact point depends on a lot of factors that we can't control or know unless working with clones of a plant you harvested before. expect the canopy to double in size at a minimum.

Seeds at 4 weeks old are not mature enough to flower. if you try to switch to flower now , you will just stretch the plants = less yield. give them another 2 weeks in veg before flipping.

What's pot size, medium and your target? Then someone can give estimates, but without that key info, its impossible to give any advice.