Beautiful looking plants. There is plenty of green fan leaves there. When the fan leaves start to turn yellow then you'll be close to harvest. I've let my fan leaves go all yellow before harvest. The tris will corolate with the yellow leaves. As the leaves turn all yellow the tris will darken. Ive followed the Life of the Autoflower Cannabis thread and have had all my questions answered.
Your plants will put on weight as she matures. Give her all the time she needs. I did a test harvest at eight weeks on one of my Shorties; vape was okay. I waited until the fan leaves yellowed and flushed them for two weeks; there was a BIG diffrence in yield, flavor and the high was much better.
I know of a grower who dosen't even cut his plants. He drys them out totally in the soil and then harvests them. I don't recommend that, but that's his style and his herb is out of this world.