I filed my taxes using the online tool. I couldn't find any way to enroll in direct deposit. Will the refund be sent by cheque to the address I filled in my information?

Yes. If you don't have direct deposit sent up, you will get a cheque in the mail to the address you entered on your tax return.

This CRA webpage has information on how to sign up for direct deposit: https://www.canada.ca/en/revenue-agency/services/about-canada-revenue-agency-cra/direct-deposit.html