Today's released version of the monitoring plugin/script check_equallogic (20121204) adds the progress in percent when the raid status is "VERIFYING".
Furthermore this version also changes the way, how the raid progress in percent is shown. Previously it was assumed that all members were sharing the same values. But as this isn't the case, the percentage had to be rewritten to support different values from different members.
E.g. when two out of three members of the group have are currently in status "RAID VERIFYING", the output will be the following:
RAID VERIFYING (88 88 %)
This means that two members are currently doing a raid verification and both are 88% done.