Did you apply online by yourself or hire an agent?
I saw one of the member that their PMV 300 just got approved the other day and took them to wait just a little over 6 months.
Tho, it's a case to case basis and depends on the country where you applying from.
Are you done with your medical already?
I hope you mentioned during your PMV 300 application that you got 3 TV refusals and explained further in Form 80, Part N, No. 39.
As what Bridge said, "Many people apply for tourist visas during the processing period of their partner / prospective marriage visa applications. At least you can lessen the time apart somewhat."
When you applied Tourist Visa or while you are on Tourist Visa in Oz, ONCE your PMV 300 is ready for grant, they're going to ask you to leave or exit Oz.
I'll be applying Tourist Visa too.