voice control start and stop listening, is there a keyboard shortcut

Here is how to do it:

• Open the Shortcuts app and create a new shortcut by clicking the "+" icon.
• Search for "voice" and add the "Set Voice Control" action. You'll then see the "Turn Voice Control On" in the left part of the screen:

• Click the word "Turn" in the action and choose "Toggle".
• Click the "i" icon (top right.)
• Click on "Add Keyboard Shortcut" and set a keyboard shortcut.
• Close the shortcut.
• Close the Shortcuts app.
• You may need to reboot the Mac as occasionally the keyboard shortcut to the shortcut you just created may not work.

Now, every time use the the keyboard shortcut, Voice Control will will toggled between on and off.

One thing I forgot to mention is to run the created shortcut at least once from the Shortcuts app by clicking the ▶︎ button. If I recall, this may prompt you to authorize some security setting.

I'm not sure what you mean by "custom command." Have you tried to create another shortcut altogether for another purpose? If so, do not hesitate to post a brand new question specific to that subject so that other users – besides myself – may see it and help you.

I’m a bit confused about your comment above (“create a shortcut so it starts in stop listening”) and what you describe in the video.

From the video, I understand that the icons in the menu bar are hidden by the camera notch (if too many are displayed). You’ll find several suggestions on the web to deal with the issue, for instance this discussion:

https://apple.stackexchange.com/questions/444113/how-to-prevent-macbook-pro-notch-from-hiding-menu-bar-icons-from-the-right

You could create a shortcut in the Shortcuts application, add the “Set Voice Control” action, set it as “Toggle” instead of “Set” and assign it a keyboard shortcut.