Update to above:
Ok ,so, discovered that if I visit the desktop ebay website I can continue to track my order. But only from the main Purchases page. There is a Track Order button available that shows all relevant tracking information. However, clicking on my order to view the order details does not have any tracking information available to me, but at least I can track it from me the main purchases page.
On the mobile website, however, I can't view the tracking at all, neither on the main purchases page or order details. Same goes for the ebay app.