Should I stop lst and let them just grow a bit before I flower?

Personally I would keep them in veg until they fill 70% of the are and then flip them, after the first 3 weeks of flower they should fill the whole space giving you the best chance at a good yield. I would also defoliate before you flip to 12/12 to improve light penetration in the canopy. And if your feeling brave maybe one more time at 21 days flower. Looks like a good start though pal👍

That's entirely up to you and your grow space! 🤘😤

Keep training them all the way through the flowering stretch

Remember they will about double in size after flipping. After you flip you will still have a few weeks to train before all energy is focused into bud production. So the short answer would be yes you can flip them now. Happy growing.