Ferry Timetables Onomichi

I'm planning to do a part of the Shimanami Kaido on 16th November. Somehow I can't find ferry timetables... Can you please let me know when ferries leave Onomichi for Mukai-shima, and back from Ikuchi-jima to Onomichi?

Can you please let me know when ferries leave Onomichi for Mukai-shima

There is now only two operators left, as seen on the map here:
https://www.japan-guide.com/e/e3476.html#section_orientation

They depart every 5-12 minutes between 6am and around 10pm.

and back from Ikuchi-jima to Onomichi?

This website is made for smartphones and lets you look up timetables (and buy e-tickets). Slightly awkward to use on desktop computers:
https://kashoki.jp/

Onomichi-Setoda

https://s-cruise.jp/timetable-eng/

Onomichi-Mukaishima

Ekimae Tosen

https://onomichijp.com/shimanami/ekimae_tosen.html

Overview of the Station Ferry (Mukojima Route)

This ferry does not carry vehicles; it is for pedestrians and two-wheeled vehicles only. The Onomichi ferry terminal is conveniently located just a 3-minute walk from JR Onomichi Station, making it a convenient ferry option for tourists visiting the area.

Station Ferry Timetable: First and Last Departures

First departure: 6:00 AM
Last departure: Mukojima departure at 10:00 PM, Onomichi departure to Mukojima at 10:10 PM

While there is no fixed timetable, ferries operate approximately every 12 minutes round-trip from first to last departure. Ferries depart once passengers have boarded and arrive at the opposite ferry terminal in about 5 minutes. Only Pedestrians and Bicycles Allowed.

One-way fare is 100 yen for adults and 50 yen for children. A baggage fee of 10 yen is added for bicycles and motorcycles. Adults can board with a bicycle for 110 yen. Motorcycles under 125cc also cost 110 yen.

The Station Ferry (Mukojima Route) does not allow motorcycles over 125cc or automobiles, including kei cars. This ferry is for pedestrians, bicycles, and mopeds under 125cc.

So please prepare 110 yen in cash.

If you are going to Ikuchijima, I highly recommend you visit the Kosanji Temple.
https://youtu.be/97Q5EjEOXI8

I'm not the first to think of this, but the place is almost like an amusement park.