This feature would also bring announcements in line with other tools in Canvas that use publish and unpublish functionality and would help instructors who might unintentionally be releasing announcements to students from a past semester.
This idea was considered when developing our product plan for Q4 2019 and is not expected to influence development within Canvas at this time.
This idea will remain open for vote.
If this idea is in the top 10% by vote next cycle it will be reconsidered.
Read more about the feature idea process:
Adaptation: Feature Idea Process Changes
How does the feature idea process work in the Canvas Community?
This is an excellent suggestion! I'd add that the current "Save" button causes confusion. Except when the announcement is delayed, this action is really more of a "Send" in instructor's minds.