Hi @clement_cheung
What you can do is query the configJobCont mo's subtree (which includes the configJob - which basically is the import job). If there are more jobs of the same policy, filter by name/date, and check the operSt attribute.
Example (using moquery, but it can be easily converted to REST API call). Also I have only one job present.
apic1# moquery -d uni/backupst/jobs-\[uni/fabric/configimp-Sergiu-Import-Policy\] -x 'query-target=children' | grep operSt
operSt : success
Converted REST API URL you should use is:
https://{{apic_ip}}/api/node/mo/uni/backupst/jobs-[uni/fabric/configimp-Sergiu-Import-Policy].json?query-target=children
Stay safe,
Sergiu