These days, there’s an app for almost anything related to deliveries. You can get apps for Fedex, UPS, the Post Office (USPS). If you order online a lot, you can also track through the store app you ordered the item from.
Amazon.com will even send a notification when the item is x stops away. You can track it and be ready for it when it arrives. You can also follow on the other delivery company apps as well.
The USPS app is great and different. You can sign up for Informed Delivery® by USPS® and you will get notifications/emails with images of the mail you should receive that day. They actually take pictures of each of your items! You can use your USPS.com account to sign up for Informed Delivery. You can also use your computer to sign up. Sign up here