Hi,
SRM API documentation. You can get protection state of VMs and other info.
http://www.vmware.com/support/developer/srm-api/index.html
If you are using vSphere Replication, certain events logged on each replicated VM. This can help you to know status of the replication.
In case of array based replication, replication is done by storage array, not by SRM. Storage array may provide replication statistics.
Michael.