Hey Subbarao,
You can use the Instance Manager within the Central Management Console, which will allow you to input search parameters and see what reports were scheduled(successfully/failed/currently running/etc). Also, as per the link that Jon posted, Paul mentions that you can run the following query in the query builder to see all scheduled reports:
Select si_id,si_name,si_schedule_status from ci_infoobjects where si_instance=1
Regards,
Brandon Persad