In your Request Timeline, is where you are able to see all the activity that has been happening for every single candidate a reference has been requested for.
The timeline delivery log gives you an overview of all the reminders that have been sent to the Referee and the candidate. These include reminders sent via email, text message and phone calls.
You can view these by simply going to Request > Hover over Delivery Log > select Email, Text, Phone.
The Request Timeline is the best way of tracking the progress of your reference since it gives you an overview of the activity of a particular reference.