Hi there you want to give the mother the time to show her characteristics first, so even though you can take cuttings at any time, you do want to make the right choice and you do want to have a decently veged plant by then. Try after 6-7 weeks of veg, minimum, try to make sure the mother is healthy, and not flowering (obviously). Yes, it's that simple ! good luck with the clones ! 🚀