Just had an FUE transplant done, how long should I wait to get back to the heavy lifting part of my job?

Chances are that you should be good to go at 2 weeks as far as heavy lifting.  Of course you should be careful not to traumatize any of the new grafts, and you should also confirm this plan with the hair transplant surgeon.  Good luck!

Two weeks would be more than adequate for hair growth. As far as widening of scars, this will take closer to six weeks, if you have had FUT. For FUE, 10-14 days is good.