Or even better just Push Message to your device when there is a status change than our phones wouldn't have to keep connecting to the servers using battery and possibly data. The Fedex, UPS and USPS apps work that way, if there's any updates they automatically post on the app and the updates are there when you open the app. But those apps don't offer any kind of alert.
What I like about Deliveries is the ability to use an alert when there's an update. And when I end up having an online shopping spree it's frustrating having packages spread across different apps for different carriers.