For your perusal we output all the CRONs that come with a default WHM/cPanel installation. This list is dated 30 July 2020 and is probably a moving target:
45 23 * * * (/usr/local/cpanel/scripts/fix-cpanel-perl; /usr/local/cpanel/scripts/upcp --cron > /dev/null) 0 1 * * * /usr/local/cpanel/scripts/cpbackup 0 2 * * * /usr/local/cpanel/bin/backup 35 * * * * /usr/bin/test -x /usr/local/cpanel/bin/tail-check && /usr/local/cpanel/bin/tail-check 0 6 * * * /usr/local/cpanel/scripts/exim_tidydb > /dev/null 2>&1 30 5 * * * /usr/local/cpanel/scripts/optimize_eximstats > /dev/null 2>&1 22 22 * * 7 /usr/local/cpanel/scripts/send_api_notifications > /dev/null 2>&1 5,20,35,50 * * * * /usr/local/cpanel/scripts/eximstats_spam_check 2>&1 45 */4 * * * /usr/bin/test -x /usr/local/cpanel/scripts/update_mailman_cache && /usr/local/cpanel/scripts/update_mailman_cache 30 */4 * * * /usr/bin/test -x /usr/local/cpanel/scripts/update_db_cache && /usr/local/cpanel/scripts/update_db_cache 25 */2 * * * /usr/local/cpanel/bin/mysqluserstore >/dev/null 2>&1 15 */2 * * * /usr/local/cpanel/bin/dbindex >/dev/null 2>&1 15 */6 * * * /usr/local/cpanel/scripts/autorepair recoverymgmt >/dev/null 2>&1 */5 * * * * /usr/local/cpanel/scripts/dcpumon-wrapper >/dev/null 2>&1 0 */2 * * * /usr/local/cpanel/scripts/shrink_modsec_ip_database -x 2>&1 33 4 * * * /usr/local/cpanel/whostmgr/docroot/cgi/cpaddons_report.pl --notify 09,39 * * * * /usr/local/cpanel/scripts/clean_user_php_sessions > /dev/null 2>&1 12,27,42,57 * * * * /usr/local/cpanel/whostmgr/bin/dnsqueue > /dev/null 2>&1 @reboot /usr/local/cpanel/bin/onboot_handler