Oh wow--I TOTALLY understand your waiting--in fact May might seem a bit too soon if you are still healing from PT on one knee and surgery on the second knee!
I have my first foot surgery in 3 days!! For me it will be six weeks with pins & screws in my bones... then I get to start walking again. Sounds like I can learn a lot from you, since what you've been through is much more invasive and intense than I will be handling! Do you have any "best advice" for me??
I certainly wish you the very best on your coming surgery and recovery for both knees (and then later on with your diet goals...!)