The IRS will automatically recalculate your refund and send you the difference. There is nothing you need to or should do (don't file an amended tax return). Refunds have started. When you get yours depends on the complexity of your return. There is nothing you can do to find out. You just have to wait.
Turbotax will never reflect this on a return filed before the law changed nor should it be changed manually becuase then your AGI will be invalid when attempting to e-file your 2021 return.
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