As the processing times vary, we cannot advise when you'll receive a call. At the moment, even after interviews and submitting evidence it is taking quite some time for them to approve visas
You only have to lodge one visa application and technically you are applying for two visas (subclass 309 and subclass 100). The visa applicant may try to enter on a visitor visa and lodge an onshore partner visa if the visitor visa is granted. Alternatively, the visa applicant can apply for a visitor visa after lodging the offshore partner visa as well.
Too all those stupid enough to do this : Partner Visa fees have increased by over 400% in the last 5 years, and it currently costs $8,850 just to lodge the visa.