A running total tracks parcels delivered so far, while a rate of change shows...

https://elliottsinsightfulinsight.quantlynix.com/posts/my-manager-asked-for-the-rate-but-gave-me-only-totals-what-do-i-ask-back

A running total tracks parcels delivered so far, while a rate of change shows how quickly deliveries are happening. This article explains the difference, why units matter, and how a time window like per hour or per day can change the story.