The Google Messages app is typically pre-installed on your Android device by default. However, in the rare event that it is not, you can easily download it from the Google Play Store on your device and set it as your default messaging application. To schedule messages using the Google Messages app:
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Open the Google Messages app.
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At the bottom right, tap the messages icon to compose a new message.
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Choose a contact as a recipient, either by selecting them from your contacts or searching for them.
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Write your message.
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To schedule the message, press and hold the Send message icon.
You’ll see some preset options for when to send your message the next day. Additionally, at the bottom of the screen, you will find an option to set your date and time for the message. If you prefer to customize the scheduling, you can adjust the day, month, and year and specify the exact hour and minute for when you want the message to be sent.