This is the way I find out late Purchase Orders (PO):
1. Search for report called: 'Purchase Order Status'
2. Under the section titled: 'Filter: Purchase Order Line' search/select 'Expected Receipt Date'
3. Once selected add '<' followed by today's date.
-> Example: today is 19/Feb/2021. In the expected receipt date field type: <2/19/2021
run the report and it should show all PO's which have an expected receipt date before Feb 19 2021.
Hope this helps!