Ahhh, my eyes. From what I can tell they look good. When uploading pics please do it with grow light off and with flash, it makes a much more useful pic.
Looking good and healthy. That net will help as they grow. Take a look at this link regarding supercroping, it may help out down the road if any colas get out of control. https://www.growweedeasy.com/how-to-super-crop-marijuana
How long have they been vegging? I would think any time you are ready. Plants will likely double in size when you flip to 12/12. Many do approx 2 month veg but you can flip after a month if that is what you want to do. Longer veg means bigger plant and bigger yield.