You need to pay your balance before April 30th (May 1 since 30th is a sunday) to avoid interest and penalties. Here are the links to the due dates or instalment payment dates.
https://www.canada.ca/en/revenue-agency/services/tax/individuals/topics/about-your-tax-return/tax-re...
https://www.canada.ca/en/revenue-agency/services/payments-cra/individual-payments/income-tax-instalm...
