Nadal's been on and off practising.
A while ago he practised for some days and then the doc told him to have a break (the one he's having now)
He practiced for about 4/5 days near the US Open and then announced the US Open withdrawal. Other than that I think he's just been doing rehab - nothing on court and no picking up a racquet. If he's back on court by mid-October that gives him 2 and half months to prepare for the Aus Open - ample time hopefully. Don't think he'll come back for WTF but may play doubles in the Davis Cup final - could be a way to test the waters too after a month of practice....