Does TurboTax send out tax return by post to a non-resident? I have returned home to Ireland and I am applying for tax back.

You can use TurboTax to prepare your Non-Resident tax return, but you would have to print and mail your return yourself.

However, the CRA is temporarily allowing non-residents to fax their tax returns in order to file. You can find the right fax number to use on this page: https://www.canada.ca/en/revenue-agency/corporate/contact-information/where-mail-your-paper-t1-return.html