I usually have patients wait about 3-4 weeks to make sure that they are healing properly. Best to ask your surgeon.
I assess my patients 1 week after surgery and prior to returning to the gym. They usually look great approx 1 week after upper eyelid surgery (Blepharoplasty or Ptosis surgery, which are my specialties), and can return to the gym after that visit -- I usually just advice taking it easy and no extreme lifting for approx 2 weeks after surgery. Discuss with your surgeon, and best of luck in your recovery.