The scrub section of the zpool status output describes the current status of any explicit scrubbing operations. This information is distinct from whether any errors are detected on the system, though this information can be used to determine the accuracy of the data corruption error reporting. If the last scrub ended recently, most likely, any known data corruption has been discovered.
Scrub completion messages persist across system reboots.
For more information about the data scrubbing and how to interpret this information, see Checking ZFS File System Integrity.