Finishing off the topic and course as a whole should not be your only intention as a teacher. An online course with the best of information and compilation of the toughest questions pertaining to the course may be of simply no use unless the students really grasp most of the things out of it. Therefore, at various points throughout the course, you, as an online instructor, should try to assess the level of motivation of students to cope with the course.
If you feel they’re stressed out, confused, disinterested, or unable to cope with the course, you may want to have a few Q&A sessions, quizzes, and classe sessions on hand just to motivate the students, help them understand the course better, clear their basic doubts, and help them grasp the topics to a greater extent.