In Canvas, the course average is not visible in Grades or Course Statistics, but can be viewed from the Dashboard.
Viewing Grades from the Dashboard
From you Canvas Dashboard click the View Grades button on the right side of the screen. This will bring up a list of the courses that you enrolled in as both a Teacher and Student.
The percentage shown here (1) is the course average and it is the Current Grade that is being displayed. See Difference between Current Grade and Final Grade for additional information.
Clicking the Student Interactions Report link (2) will bring up the Teacher Activity Report which provides both the current and final scores as well as a list of ungraded assignments for all of the students in the course.
Other Course Statistics
If you are interested in other types of data about student performance, see How do I view analytics for a student in a course?