When your first creating an online course within Canvas, it defaults to a status of "Unpublished." This allows you to continue to edit and revise your course modules and content until it is in a ready state for students to access.
As an instructor, there is a built-in "Course Setup Checklist" you can access from a section of options labeled COURSE STATUS. This checklist includes the reminder to publish your course once it's ready. At the University of Utah, as the "owner" of your course, you have full control over when it is published.
For full instructions on publishing a Canvas course, see the Canvas Guide provided by Instructure: