If you want to see the last time a student accessed one of your courses you can do it through the Student Management Dashboard.
Use either the student search function or search manually through the membership or course that the student belongs to in order to locate them.
Click on the students name. You will then see a list of the courses the student belongs to. You can see within this list of courses a column for 'Latest Activity'. Here is where you can see the last date a student logged into your course: