Your arms and hands are fine, no numbness.
The reason you're a T-Rex after top surgery (for a DI, anyway) is because you can't lift your arms over your shoulders. And you shouldn't be lifting or carrying much of anything. Put your right hand over your chest and move the left arm around up over your head and you will feel the muscles and skin move. All that is greatly restricted after surgery.
I can move my shoulders forward and backward ok, but raising my arms above shoulder height, nope.