Microsoft launches the functionality of delayed message sending through its Teams client. I was looking for a way to send messages at specific times, I am fulfilled.
When a colleague is on leave for example and you don’t want to disturb him 
If you want them to know that you have a message for them, but you don’t want them to miss it, this is a great way!
Source: Microsoft Teams: Delay delivery of chat messages
First, type your message in the Teams client, when you have finished, right click on the sent icon as below:
Then you will see the following window:
Select the date and time of your message and click the Send at scheduled time button.
As you can see below, you have only one week in which to send your scheduled message. But that’s something!
If you ever want to cancel your scheduled message, right-click again on the sent arrow and click Cancel scheduled time
