No, the RRSP contributions that were made in the first 60 days of 2021 can only be reported on the 2020 return. Only RRSP slips from contributions made between March 3, 2021, and March 1, 2022 (inclusively), are to be entered in your 2021 tax return.
You can report your first 60 days of contributions by signing into your 2020 TurboTax Online and making an adjustment to your return.
For more information, please review the links below.
TurboTax Canada FAQ
I've filed my tax return. Can I still make changes?
Canada Revenue Agency
Change my return: Online adjustments for income tax and benefits returns
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