I know how you feel but it's just not worth it...
Ofcourse you CAN cut it down whenever you want it's your plant but,
don't let your work go to waste by cutting now it just wont be the same
plus you still gotta wait for it to dry and all that good shit, so your still gonna have to wait
Trim some of the bud leaf off the plant. it will get you high, and won't hurt the plant. just don't go nuts.
you can dry it out in the Microwave. Cut enough to roll a fat joint. Might not be the best, but beggars can't be choosers.
Depending how far along they are.. I'm going to assume Sept 16 was according to breeder specifications or your own eye. Either way could easily be 2 weeks off. Since we are a good ways from that date anyway you would lose most of your yield and potency, it will most likely taste like plant or veggies.......if your like me and consume massive quantities of herb or go crazy I would suggest you turn it into hash oil. You can do a qwiso and buy all the material you need for less than 5 bucks