Yesterday, I added one tag to this question, but I didn't get the Organizer badge.
Jeff is still working on implementing the ability for the server to see into the future.
It should be coming soon, but until then, you're probably going to wait until a few minutes or maybe an hour after the your re-tag actually happens.
Edit: After looking at your question and account, I think you have misunderstood what the organizer badge is.
It is for re-tagging other people's posts, not your own. This can be done after you've reached 500 rep.