If it’s too late at night or too important to forget, you can schedule a message to be sent at a later time, instead of sending it as soon as you finish it.
Note: You must be using , then tap Send Later.
Tap the time to open the scheduler, then choose when you want to send your message.
The border of the text field turns into a dashed line, and the time your message will be sent appears above the message.
Enter a message, then tap to resend with edits or Turn read receipts on or off in Messages on iPadDelete messages and attachments in Messages on iPad