If you're using multiplatform Telegram Desktop app, try opening your settings and typing workmode.
A pop-up should show up asking if you're willing to enable workmode. Submit and enjoy being able to hide the muted chats in your chats list.

Open the Telegram app updated to the version 5.11 or higher.
Enter in the individual or group chat that you want to schedule a message for.
Write the message and hold down the send button.
Tap Schedule Message and set a date and time for the content to be sent.
Tap the lower button to leave the message scheduled. ¹⁾