Yes you can tip plant.looks like the is 4 sets of leaves there i tip at 3rd node slows em down about a good couple weeks..your plants look good dude..how much are you watering them.
Could I use the cutting as a clone? Or do I need to wait for the stem to go a little bit higher in order to use it as a clone?
It's going to slow down growth for a couple of weeks oh man )
@Tas devil I am watering it every 3rd or so and sometimes I add lemoj water or some ormus I made but I'm not sure how much it improves the plant
How about your plant?
You definitely need a longer stem to make a clone. Just top it at the 4th node and wait for the new growth to come in. Let it veg for another 3-4 weeks before you try to clone, the plant is just too small at the moment.