There is not actually a waiting list to become a legendary member, you will become a legendary member when you have the random required amount of activity that is based on your UID and a secret hash.

Theymos has said that only two people have access to the code that contains the secret hash, and that he will never give it up himself. My best guess would be that either BadBear or grue is the other person who has access to the code with the secret hash, so in theory one of them could tell you when you will become legendary, however I would not personally hold my breath waiting for either of them to do so.