Progress
Visit https://github.com/me50/USERNAME, where USERNAME is your GitHub username, to see your submissions, each of which should appear as a "branch" whose name begins with ai50/projects/2020/x/. You can also check your progress at https://cs50.me/cs50ai after having completed the instructions in Project 0, though you won't see any scores until your work has been graded.
Check your email for a confirmation from Google that you submitted a project's form. Check your gradebook at cs50.me/cs50ai after your work has been graded for your latest status in the course.
Verified certificates are issued by edX within 30 days of receiving a satisfactory grade (70% or better) on all projects and all quizzes.