A couple of suggestions...

First off, this is a great app with a ton of potential. It tracks your packages from any shipping company that you could think of. Clean interface and ease of use app navigation.
A few things though, would be a nice add-on.
First, there should be a map, after you select a desired delivery instead of pressing on "°°°" and then "find on map".
Second, an option to select how many deliveries you can see in widget, because one is not enough, from where Im standing

Sega77 about Parcel - Delivery Tracking, v4.0.3