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TL/DR: You should expect APP to be completed at check-in for all flights which means in Zurich.
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You can read all about it here: Advance Passenger Processing
Some notable points:
This Answer is based on experience with the big Western Hemishpere travel schemes and I have no reason to think Australia approaches this much differently. I've had to read all of these guides and they're only as specific as they need to be and don't attempt to address every conceivable scenario, that's what the phone number or telex is for. If any Member who works for QF or BOC provides a more detailed answer, I'm happy to remove this one.