A bit more information would help in answering your question to be honest.
Not knowing what kind of weights you're using and how you're progressing them makes it very hard to say when a deload would be most appropriate. In the same vein, not knowing what your cut is like doesn't help either. If you're doing it slowly and fairly gradually, it won't have an overly significant negative impact on your training, but if you're cutting aggressively it definitely will.
Very, very broadly, deload at least every eight weeks, six may be better. I do well every fourth. Definitely deload before you feel you need to. Take a week to train less intensely, do some different stuff and drop the volume. You'll do better for it.
HOWEVER, if what you at set out is all you're doing you may not really need to deload much at all, because that is a very, very, very low volume of work. Plus, if you're working in that three to six rep range on your heaviest lifts all in one session the intensity won't be very high either. This isn't a knock, just how I see it. If it's working there's no need to change.
I would recommend some upper body pulling besides inverted rows though. Heavy dumbbell rows would be my go to in this case.