How can I see my solidarity tax benefits calculation and see how much I am getting back? I can't find it in Turbotax, there is only Schedule D available.

TurboTax doesn’t calculate the credit, as you will receive it as monthly payment, not as a deduction/credit on your tax return. Revenu Québec will use the information from your tax return, and advise you of the amount of your tax credit.

You can get an estimate of how much Solidarity Tax Credit you will receive here: https://www.revenuquebec.ca/en/online-services/tools/solidarity-tax-credit-payments-estimator/