Taxes withheld from a distribution taken in 2020 will be credited on your 2020 tax return. 2020 TurboTax will do this when next year you enter the 2020 Form 1099-R that shows the withholding in box 4. To be able to roll over the entire gross amount of the distribution, you'll need to substitute funds from another source to be able to complete the rollover by the 60th day following the date of the distribution.
