Welcome to the group! Scheduling that first consultation is a big step! You will get a lot of questions answered during that meeting but I expect as you go through this process you will also have new questions.
The timeline varies a lot depending on your surgeon, insurance requirements, and whether any additional testing is needed. The pre-op appointments, testing, nutrition visits, and other requirements feel slow, but they are designed to help set you up for success and make sure you're as healthy and prepared as possible.
Some people have surgery within a few months, while others take six months or longer. I was on a 6 month path to the sleeve but pre surgery testing discovered gallstones. My gallbladder needed to be removed which delayed my bariatric surgery and added 2 months to my wait.
Wishing you the best on your journey, and don't hesitate to ask questions along the way. There are a lot of people here who have been exactly where you are.