If this is for a Moodle or Micro Course your certificate will be available online at the end of your course. You can save this and print as and when required.
If you are studying a SL5 or SL 6 course then it can take a few months to receive your certificate. This timeframe can be substantial during busy periods.
Once you have passed your course, your work will be in a stage of moderation for one month. After this you will receive an email confirmation of completing your course and a date to expect receipt of your certificate.