Most insurance requirements are 6 months or so. My surgical group actually won't even submit your paperwork to insurance until you attend a 6 month nutrition class. Between all the appointments and insurance requirements, my entire process was about 1 year from initial seminar to surgery. You most definitely are not the only one that went or are going through it. You should actually feel thankful that your insurance will even accept you. Many flat out deny requests for WLS.
Unfortunately it's just one of those things you have no control over and need to patient about. Pushing the surgeon's office certainly won't help. What might help is starting to prepare yourself now for some of the post surgery things you'll have to do.
1. Work on the 30/30 rule. This is probably something you have been introduced to already. Don't drink 30 minutes before your meal, take about 30 minutes to eat your meal, then don't drink anything for 30 minutes afterward. Trust me, it's harder than it looks and takes time. Getting used to it now is better than trying to learn later and hurting yourself by drinking with a meal.
2. Get used to taking Vitamins. Find chewable or liquid options for after surgery. Vitamins will be your friends for the rest of your life.
3. Research Protein supplements and find one that you like. Just be warned, your tastes will change after your bypass surgery.
4. Find other online resources for recipes. You'll most likely be on a liquid diet for a bit after surgery, then will progress to mushy/purees. Resources like Eggface or Bariatric Foodie might help you learn a bit before the surgery. Education is the most important part of your journey.
5. Work on weighting and tracking your food. You'll be on a strict portion limit for at least the first 6 months or so after surgery. Get used to weighing foods and forming the habit now.
Just be patient. I know it's not what you want hear, but it's the truth. And remember, it's a marathon, not a sprint, even after surgery. It won't happen overnight.