You can view scheduled messages to be sent at a specific date and time.
Viewing Scheduled Messages in iOS
To view a scheduled message in iOS:
Open a chat conversation. Messages are displayed in thread view.
Select ⋮ (the menu icon) in the top right of the screen.
Select Scheduled messages.
The scheduled message is displayed with the specified date and time.

If there are no scheduled messages the following is displayed:

Viewing Scheduled Messages in Android
To view a scheduled message in android
Open a chat conversation. Messages are displayed in thread view.
Select ⋮ (the menu icon) in the top right of the screen.
Select Scheduled messages.
The scheduled message is displayed with the specified date and time.If there are no scheduled messages the following is displayed:
