a small harvest before the light cycle changes? not exactly sure what you mean by this, also, are you in the southern hemishphere or just the tropics, bc there is no way anything is growing my neck of the woods right now, ive got a few seedlings about 2 weeks old as well that will be put outside after the final frost....
checked on another thread of yours and saw that youre in texas, i doubt if youll have to worry about flowerings plants, they'll be stunted from the cold weather and even indoors with perfect temps if you 12/12 from seed it can take in excess of a month for them to show sex, so outside in 40 degrees id say you're loooking at 8 weeks to show sex even if they were to try and flower, ive currently got my 3 growing (all about 5 inches tall, with 2, 3, and 4 nodes respectively) under just 2 23 watt cfls but they're in a 2x2 container with computer paper tacked to the sides for some ghetto fabulous reflectivity lol
id say def just plan on vegging some TREEES if they're growing this early, i plan on topping mine atleast once, then maybe topping those shoots as well
good luck to ya though big guy, i wish i had 20 acres, id have enough each season to last me til the next