"Any ideas"

Yes.

See the Estimated Delivery Date & wait for the item to arrive.

Read the eBay Money Back Guarantee so that you know what to do should the item not arrive on time.

https://www.ebay.com.au/help/policies/ebay-money-back-guarantee-policy/ebay-money-back-guarantee-pol...

It may be in Australia or even at you front door today.   Just because there is no tracking updates it doesnt mean it hasnt moved.