Staff Check In functionality via My Schedule can be required, and customized text can be added too.
To update staff check in, navigate to Settings -> Product Settings -> Global Product Settings -> Staff Check In.
Required setting
Set the 'Require staff check in' option on or off as required
Customized Text
The message staff see when checking in can be updated as often as you'd like. Click Edit to make changes, update the note as required, and then select Save once completed.