it's been 3 days since surgery and my eye is still droopy. When should I expect it to be fully correct? (Photo)

Just a few day is so very early from a surgery like this.  You need time to heal.  Much more time.  I would say you need 4 to 6 months to know how this is likely to heal.

Did they do an internal or external repair?  Sometimes the post-op swelling will weigh down the lid so that it won't open fully.  So give it a couple more days and see how you do.  If the lid stays low and they did an external repair, it can be adjusted early on.  If it was from the inside of the lid, you will have to wait before doing any revision.

It is too early to tell given all the swelling and that you just had surgery recently.  I would recommend you to continue following up with your surgeon as planned so your progress can be documented. It will take several months to get a gauge on what your final lid position is though since it takes time for all the swelling to resolve. Good luck.