Australia Post has announced, due to the current pandemic, Express Post can not be guaranteed Next Day Delivery. It may take 2-3 days depending on your location.
Parcel Post option may take 7-14 days, with regional areas taking up to 21 days.

If you include your email address Australia Post will email you a tracking number as soon as your parcel reaches a distribution centre, so please check your spam/junk and inbox.