Please read the below good articles before go with querying the managed metadata column values through Content Query Web part:
https://chrisjohnson.tech/2014/03/25/sharepoint-querying-on-multiple-select-managed-metadata-columns-in-content-query-web-parts/
-Thanks to Chris.
https://blogs.msdn.microsoft.com/ecm/2010/05/14/whats-new-with-the-content-query-web-part/
https://chrisjohnson.tech/2014/03/25/sharepoint-querying-on-multiple-select-managed-metadata-columns-in-content-query-web-parts/
-Thanks to Chris.
https://blogs.msdn.microsoft.com/ecm/2010/05/14/whats-new-with-the-content-query-web-part/
