Nice. That top bud is well lit now. That's obviously where most of your production will come from so if you can figure out a a way to get good light there, you'll usually always get a decent yield. As far as yield from this plant you can maybe expect around 14 grams. I forget what week you are in, but your plants still look young to me. Maybe another 20-30 days until they're ready to harvest? You could get more than 14, but probably not much. Hold a coke can or something right up beside that top nug, and snap a photo. Should be able to get a pretty accurate idea that way. Remind me, what week of flowering is it?