I am wanting to change my username, and every that I want is attached to an account that isn't in use (pretty positive) but doesn't have a date it's being deleted yet. Is there a list of accounts which are going to be deleted and when?? Thank you!

Accounts don't get deleted anymore, actually! They go into an "inactive" status after they haven't been logged into for a full year. Once they get put into inactive status, that's when their username and pet names are up for grabs. If an account is a few months away from being put into inactive status, there will be a bar at the top of their profile saying when their username and pet names will be up for grabs. Once they are "inactive", the bar at the top will change to say so (here is an example of an inactive account). Alternatively, if an account has been frozen, it'll be up for grabs a year later (here is an example of how that looks). There isn't really a "list" of accounts up for grabs. That would make it a little too easy.

I hope this helped!