Here's some information from the CRA website:

Has my application been processed?
You can expect to hear from the CRA within 80 calendar days after the CRA receive your application. If your application is not complete, the CRA will ask for the missing information. This will delay the processing of your application.

After the CRA process your application, the CRA will send you a Canada child tax benefit notice. It will tell how much you will get, if any, and what information the CRA used to calculate the amount.

The CRA may review your application at a later date to confirm that the information you gave the CRA has not changed.

You can contact the CRA to find out about receiving your payment: 1-800-387-1193