Easy. I’d do it when I can execute a very heavy squat workout with no pain, or at least not enough to make we worry about coming out of position. I’d be comfortable playing ball when I can load the hell out of the barbell and I don’t have to think about my foot. It will happens faster than you think.
Also, go to a local sports store and get you a comfortable, but relatively stiff pair of insoles for your shoes and get ones that have a mild arch support in them. You’ll thank me in due time.