USERNAME is your GitHub username, to see your submissions, each of which should appear as a "branch" whose name begins with
games50/assignments/2020/x/. You can also check your progress at https://cs50.me/cs50g after having completed the instructions in Assignment 0.
Check your email for a confirmation from Google that you submitted a project's form. Check your gradebook at cs50.me/cs50g 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 assignments.