I had lumpectomy and full ax clearance Oct 2016. It takes a while for the sensation to come back. You start to feel small electric shocks as the nerves try to get going again.
I would say it took a year to get the majority back and probably a bit longer to feel light touch. It's over 3 years now and around the scar line is still numb but the rest is ok now.
As far as movement and strength goes you probably need to triple the exercises they give you. Especially the ones above your head, the walk walk etc.
Personally I hate structured exercise and I'm bad at doing it so I found painting was constructive and gave me incentive to do more than I would have just doing 20 or 30 reps of each exercise. Plus I got my ugly timber ceiling sparkly white :)
Some of the time frames are getting a bit blurry now but I had good movement and strength within 4-6 wks and it just kept improving the more I did with it.