When I had a hysterectomy, different op I know, I referred myself to Occu Health who I found to be very helpful and reasonable.....also, because I had referrred myself, the consultation was considered to be confidential and could only be disclosed to my boss with my consent.
Not sure how your Occu Health works, but it might be worth contacting them yourself before your op to find out.
As eveyone else has said, you cannot predict when you will be fit to return to work ...anything can happen after the op, from wound infections to having other connected or unconnected problems....no one can predict when you will be fit enough to return to work. You have to play it by ear.
Good luck with the surgery and the aftermath.