Read this and let me know if this is what your looking for. We also have a Weekday raid that goes tues/wed/thurs 9-12 EST. My info is at the bottom.
https://us.forums.blizzard.com/en/wow/t/herod-a-maelstrom-semi-hc-fri-9-12-pm-sun-8-11-pm-est/654275