First, if I recall correctly, you can't apply for NUPOC because you already have a degree and are on Active duty. NUPOC is a commissioning program for college Sophomores (Juniors?).
Reaching back 4 years or so, the OCS selection board convenes several times per year (if my memory isn't too fuzzy).
If you're in "A" School, talk to the school's Career Counselor. That is just the kind of thing they do.
As for chances of getting picked up, etc, someone else on here may have some more realistic idea.
Best of luck and thank you for volunteering to serve!