Wearing a Mask or Face Covering will be required in indoor public spaces beginning July 7, 2020 under City of Toronto By-Law 541-2020 PDF. The mask or face covering should cover your nose, mouth and chin, without gapping. Wearing a mask or face covering is an additional measure we can take to reduce the spread of COVID-19 and keep each other safe. This means that, with some exceptions, all customers or visitors entering an indoor premise are required to wear a mask or face covering while inside

https://www.toronto.ca/home/covid-19/covid-19-what-you-should-do/covid-19-orders-directives-by-laws/mandatory-mask-or-face-covering-bylaw/