i'd personally let it grow another node before pinching it, but you could if you wanted to, it's got enough nodes, I just like them a little taller to make root pruning and repotting easier for me. I would let it grow another node, pinch the top, wait for the side branches to grow out, and within a week or so, you could take clones off of the developed side branches. Cutting the top off of those will encourage all nodes on the side branches to grow out, and then you will have yourself a nice little cannabis shrub for taking lots of clippings.