@FloridaGal1976 - My knees are almost as bad as yours. I'm bone on bone in both knees - similar height - weighed more and am older. Here's why I opted for going with insurance. (First - find out what your insurance requirements are - it may not be the six to 8 months you think - call and ask to speak with a nurse manager or case manager to get the answers.)
My team required attendance at a group session (I did that end of April 2016) and had my first appointment with my surgeon on May 11, 2016. My surgery was on August 23, 2016. That was just enough time to get all the pre-op crap done - endoscopy, barium swallow, cardiology clearance, orthopedic clearance, pulmonary clearance and psych eval. All of that was required by my hospital group and not my insurance, although my insurance covered everything (except co-pays) except the psych.
HW 271.5 SW 246.9 CW170-177 fluctuating right now. So I'm somewhere between 95 and 100 pounds down in 10 months.
Pre-op - I was good for at least 1 Vicodin a day to control my knee pain along with regular cortisone shots and Synvisc for my knees. I've taken maybe 3 Vicodin since August - one was a result of running 2.5 miles without warming up well enough.
As I'm sure you've read - a sleeve is a tool. So getting your head in the right place and understanding what's going on is important. It's not a long wait and while I was impatient at the start, I'm glad I had the three or four months. I spent time learning to eat better and making peace with a number of things.
What can I do now that I couldn't before - I fence (as in en garde) about 5 hours a week. I strength train another 2 hours a week. I do pilates.
While I had the surgery to try to speed up having bilateral knee replacement, based on my last conversations with my knee surgeon, I'll be able to put them off at least another 5-7 years.
Wait it out. You'll be fine. I understand the impatience, but this is a learning process.
Good luck.