You might want to find out why you are seeing parcels in the Live Status report stuck at the same status (e.g. the Attempted Delivery status) without being recorded as Delivered.
You would select the Delivered event as an Exact Scan event in order to reduce the dataset to just the latency for that type of event, and then keep only the desired carrier service:
You see that the scan latency for Delivered is unacceptable and backs up the Live Status report. You can then use the Drillthrough option to be taken to the Scans by Order tab so that you can take the requisite action.