The latest update to the Slack Scheduler update introduces advanced scheduling with timezones and much more.
Your messages give better feedback. You can see the content of your messages if something went wrong while scheduling.
You can now tag users, @here or reference another channel the same way you would when writing a message normally in Slack.
This update addresses an issue with some workspaces when scheduling messages in direct messages.
In this update, you may receive a message that you need to authorise the app to send messages in Slack on your behalf.