You do not need to take any extra steps to exclude your wife. TurboTax will calculate the Recovery Rebate Credit based on your tax return entries. Just answer the questions and enter data that is presented to you in the TurboTax interviews.
It appears that since you are making an election by filing a joint return to consider your spouse a resident alien for the entire tax year 2020 and she has a valid social security number, she would meet the eligibility requirements for the Recovery Rebate Credit.
Here is a link with more information on making the resident alien election.
Also, see the "Resident Alien" question here.
Finally, use this link for more information on the Recovery Rebate Credit
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