A running total tells you how many parcels have arrived so far, while a rate...

https://city-wiki.win/index.php/What_Does_an_Instantaneous_Rate_of_Change_Mean_for_Rainfall%3F

A running total tells you how many parcels have arrived so far, while a rate shows how quickly they’re coming in. This article compares both, with clear units and time windows so daily counts don’t get confused with parcels per hour.