Today's updated information about the Provincewide Shutdown can be read in this 28 page Ontario Ministry of Health PowerPoint with details about the Businesses Permitted to Open and Sector Specific Restrictions (Slides 11-23) https://www.ontario.ca/page/covid-19-provincewide-shutdown
For even more specific details on the rules concerning the Dec 26, 2020 lockdown here is the link to Ontario Reg 82/20 Rules for Areas in Stage 1 https://www.ontario.ca/laws/regulation/200082