Application process for Australian Universities

Hi -
Has anyone applied to an Australian University? I’m trying to understand the timing to apply to Sydney University. My son (a dual-citized us/aus) is a Senior graduating in May 2020 from a US highschool. . Ideally he’d apply in Nov/Dec for a decision in the spring (so he can choose among all offers) but with ability to defer admission to Feb 2021 (primary fall start for incoming freshman). Anyone know if this is doable?