Hi there,
I had the same case. I submitted my application in Hamilton ON then moved to Toronto. I called CIC to change my address and the agent told me as your application is still in Sydney no delay will happen. I think it's reasonable. So if your application is still in Sydney, you good. If you change your address which changes your local office, you will have a delay of 6 to 8 weeks (according the CIC agent).
Hope it helps,
S.