AsNoriuanswered grow question 2 years ago I did supercroping even i late flower stage on autos, like week 4-5 of flower. You are not even close, so i would recomend, BUT :
Do it in the morning, dont crack stem, so do slowly, till it take to naturally fall, give support up and down.
I did it many times, was going deeper into flower, but never had bad results, just better bud quality.
Prethink were you will position that timber, and do it !