Can I change my status to E-3 visa status if Im already in the US in another nonimmigrant visa status?
Yes. If you are already in the US in another nonimmigrant visa category, your US employer may file a change of status petition by filing a Form I-129 (Petition for a Nonimmigrant Worker) with the USCIS Vermont Service Center. However, you can only be approved for a change of status if your present visa category supports a change of status. For instance, you cannot receive a change of status from the VWP as this category does not allow a change of status.