Another 2 weeks might do it.
The calyx are beginning to swell.
I see signs of over-watering and those fans are toast, but fans are used for stalk growth and storage.
Stalk growth is done and them fans are empty so no worry 'bout dem.

The sugar leaf is the food engine now and will supply the energy for bud growth and resin production.
With the fan leaf gone, transpiration will drop drastically.
They will need less water, give them less, and stop feeding about now.
Let them limp across the finish line and try for at least a few amber colored capitate glands.
If you harvest when all the caps are clear, you will get a short-term, spacey head effect but there is very little medical value.

And a 2' X 2' X 4' box is inadequate for 2 decent plants and 2 seedlings.
Do yourself a favor and build a bigger box.

I can tell you've been reading, Keep it up.

Aloha,
Weezard