Sometimes I have been waiting for items posted in a red mailbox. The tracking usually says "pending" until the item is scanned, which usually happens at major sorting centres like Sydney/Chullora, Melbourne etc., but sometimes, as others have said, the items only get scanned on the day they are on board for delivery, or even worse when they are delivered.

I hope eBay takes delays into consideration at the moment, just as they do when buyers are waiting for something, then it should be OK for you, as the item will be scanned at some stage.