The definition of ‘specialty occupation’ is one that requires:
Note: In determining whether an occupation qualifies as a ‘specialty occupation’, follow the definition contained at INA 214 (i)(1) for H-1B non-immigrants and applicable standards and criteria determined by the Department of Homeland Security (DHS) and USCIS.
An E-3 alien must meet academic and occupational requirements, including licensure where appropriate, for admission into the U.S. in a specialty occupation. If the job requires licensure or other official permission to perform the specialty occupation, the applicant must submit proof of the requisite license or permission before the E-3 visa may be granted. In certain cases, where such a license or other official permission is not immediately required to perform the duties described in the visa application, you must show that you will obtain such licensure within a reasonable period of time following admission to the U.S.
You are required to have a job offer in the US before you can apply for an E-3 visa. Therefore, if you enter the US under the visa waiver program you will need to leave the US to obtain an E-3 visa and return once you have a job offer. However, if you enter the US in another visa status your new employer may be able to apply for a change of status on your behalf.
You may make your appointment for an interview as soon as you have all the documents prepared.