If you enable reports in Institution Settings > Reports, reports will be available via email around the time when files of records have been output and/or after there are changes to your holdings in WorldCat. When your first report is available, you will get an email from Usage_Statistics@oclc.org with the subject field: "The report [name of report] you requested for [YYYYMMDD]."
You will not receive an email on days when there is no activity. Reports are also available in the OCLC Usage Statistics Portal and they are identical to the reports that come by email. See how to access reports in the OCLC Usage Statistics Portal.
To receive emailed reports:
There is not a way to select only certain reports per email. The email address(es) entered will receive all selected reports.
Many libraries that have collections that output records on an ongoing basis select the Updated Records report. The report will notify you of critical changes like OCLC number merges and the reason you received an updated record even if you have not enabled WorldCat updates.