I had mine done a little over 2.5 yrs ago. I went back to work after 10days. I stand all day too.
With your job description, I wouldn't recommend you going back to work that soon, even with post op leg brace.
If you had a limited duty job that would allow you to stay on even surfaces w/out climbing, heavy lifting, stooping, bending or just sitting and doing data entry , that would be much more idea.
It took me about the 2 yr point where I stopped having that stiffness or swelling sensation in my knee after standing all day.