The main colas are coming along nicely. I would suggest that in the future, since you are not using hps, you bend over the plants so that the main cola is as close to the light source as the secondary ones. fluorescent lights do not have the same penetration that hps has and it is important to have much of the plant close to the light.
You can't really top autoflowers without losing yield due to them maturing so fast. So bending them over using a wire or a rope would probably be your best bet (low stress training). I'm currently growing some photoperiods and I used low stress training to make all of the colas even so I plan on having a really nice yield.
Good luck man! I hope you get a good amount of great smoke!