Hard tell at this stage…. But quite alot 
no clue. my last harvest was one plant in a 3x3 tent. Dry weight excluding trim was 636 grams. This plant was exceptional. More typical weights range 350 - 450.
Your watts per square foot is similar to what I run.
3x3 tent has 450 watts (50w ft2)
2.5 x 6’ closet has 780 (52w ft2)
From a couple weeks ago. two GDP in the closet
Then I have 400w over a 2x2 scrog frame. This is my play area
At 18" 100% for 18 hours DLI >80, at 12 hours DLI is about 55. I usually run it at 20 - 22" especially mid to late flower to minimize foxtailing.