If it has been more than 4 weeks since you filed, you should contact the CRA at 1 800 959 8281.

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As per CRA, 

The CRA's goal is to send you a notice of assessment, as well as any refund, within the following timelines:

• online - 2 weeks
• paper return - 8 weeks
• non-resident returns - 16 weeks

These timelines apply only to returns that are received on or before the due date.

The CRA may take longer to process your return if it is selected for a more detailed review.

Thank you for choosing TurboTax.