See the following.  You might want to also download your Online return as a PDF.  That way you can open your return without having the TurboTax software.  You would need a PDF app on your computer, like Adobe Reader.

How do I save my TurboTax Online return as a tax data file?

https://ttlc.intuit.com/community/saving/help/how-do-i-save-my-turbotax-online-return-as-a-tax-data-...

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How do I save my 2020 TurboTax Online return as a PDF?

https://ttlc.intuit.com/community/saving/help/how-do-i-save-my-turbotax-online-return-as-a-pdf/00/26...