No, you need not worry about mailing anything in, but keep all documentation and expenses claimed in case the CRA asks for it later.
Please refer to link below if needed to ensure you have Netfiled your tax return to the CRA (if needed)
How do I know if my return was filed using NETFILE and received by the CRA?https://turbotax.community.intuit.ca/replies/2864697You have clicked a link to a site outside of the TurboTax Community. By clicking "Continue", you will leave the Community and be taken to that site instead.