You can start using your maiden name immediately. However, certain documents (drivers license, passport, etc.) will still require your married name to be used until the divorce becomes final.
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In order to change your name on government identification cards you will need to wait until you have either a "Status-only Judgment," or the final judgment in your case. Until then, as the other attorney said, you can use your maiden name. It just won't be fully official and you will have to explain things until you have the paperwork from the court to verify the change has been made.