How to (try to) suspend and how to tell if it was suspended?

[mikehenson]

Please supply the answers in the original post. If we visit the post you can assume we would like to see the answer.

All answers below are for Phosh:
Where is the "Suspend" button in Phosh? - There is not one. Make your own desktop file. see below.
Is it the same as screen lock? - No. Lock screen and suspend are different.
When the phone has its screen dark/seemingly off, how to tell if it is actually suspended? - Suspend will turn off the notification LED.
Is "suspend" the same feature as "sleep" and "standby", or are there nuances/differences? - I will assume there is only suspend.
How to try to suspend from command line? `systemctl suspend`? 'systemctl suspend'
Given that suspend is fully supported/enabled, when is the phone supposed to suspend automatically? - Can change in settings. Default is 1 minute to lock and another minute to suspend.
What about hibernation? - I do not think this is an option.

My Desktop file:
cd /home/alarm/.local/share/applications
nano suspend.desktop

[Desktop Entry]
Name=Suspend
Type=Application
Icon=system-log-out
Exec=systemctl suspend
Categories=Utility;

'save and exit nano'