Information on the number of COVID-19 cases in Ontario is available at https://covid-19.ontario.ca. The web-page is updated every morning with information as of 4pm the previous day. The site also includes details on hospitalizations and ventilator usage, as well as access to a daily epidemiological summary. Cases within Peel are available through Peel Public Health's website here they are broken down by municipality. Neighbourhood-based data is not available. If tracing reveals an affected individual was in a public area, you will be notified through the media or directly if possible.
Trillium Health Partners also provides COVID-19 data on patients under their care. Information is available here: https://trilliumhealthpartners.ca/patientqualityandsafety/Pages/Novel-Coronavirus.aspx (bottom of the page).