https://www.canada.ca/en/immigration-refugees-citizenship/news/2020/04/removing-barriers-for-international-students-working-in-essential-services-to-fight-covid-19.html
April 22, 2020
—Ottawa—To help battle the COVID-19 outbreak, starting immediately, the government will remove the restriction that allows international students to work a maximum of 20 hours per week while classes are in session, provided they are working in an essential service or function, such as health care, critical infrastructure, or the supply of food or other critical goods.