It looks like the "pr_perf_stats" table saves all necessary information needed to tune a query and get this. In my case I was able to get a count of all operator sessions in a day with the following query. Date can be change a needed and remember this table only saves information for the last 30 days after that if automatically deleted unless this setting in changed.
SELECT COUNT(*) FROM (
FROM schema_name.pr_perf_stats s
WHERE s.PXREQUESTORTYPE = 'BROWSER'
AND s.PXREQUESTORSTART BETWEEN TO_TIMESTAMP('17-Jul-2022 1:00:00 AM') AND TO_TIMESTAMP('17-Jul-2022 11:59:59 PM')
GROUP BY s.PYUSERIDENTIFIER