How to Check If the CRA Received Your Payment

After you've made a tax payment, you'll want to make sure the CRA received it. It usually takes a few business days for a payment to show up in your CRA account. You can confirm your payment was received by logging into My Account and checking the "Accounts and payments" section.

For payments made by mail, it can take longer to process, so it's a good idea to keep a record of your cheque and the date you sent it.

Source: https://www.canada.ca/en/revenue-agency/services/payments/payments-cra.html