The below SQL report will return all the default queue owners of all your helpdesk desk categories along with the settings.

SELECT 
USER.FULL_NAME AS OWNER_NAME,
USER.EMAIL,
HC.NAME AS QUEUE_NAME,
HC.ORDINAL,
HC.DEFAULT_OWNER_ID,
HC.CC_LIST,
HC.USER_SETTABLE,
HC.HD_QUEUE_ID
FROM
HD_CATEGORY HC
LEFT JOIN
USER ON HC.DEFAULT_OWNER_ID = USER.ID
ORDER BY HC.HD_QUEUE_ID

And the results look like the below