The word 'toggle' itslef means switching between two states. But is it proper to use explicitly like 'toggle ON' or 'toggle OFF' ? How the usage for that word should happen?
Saying "toggle on" is okay, if you are using a toggle switch, or a toggle form control on a web page.
If you are talking about "activating something" then "turn on" is more common. "Toggle the switch to the 'on' position" is longer but explicit.