To get the Canada Emergency Response Benefit faster once applications are open, you can sign up in advance: My Account through Service Canada https://www.canada.ca/en/revenue-agency/services/e-services/e-services-individuals/account-individuals.html

There is a short 3 minute video too that explains it well: https://www.canada.ca/en/revenue-agency/services/e-services/e-services-individuals/account-individuals.html

And if you can, choose direct deposit to get money into your account sooner.