How do I check if my routing number and checking account number is right on my already processed tax form ?

You can confirm the direct deposit information you provided by following the below steps:

1. Open your return if it's not already open.
2. On the Tax Home screen with the amount of your refund and status, scroll down and select Add a State (don't worry, we're not adding a state) to access your tax forms and worksheets.
3. In the left menu, select Tax Tools then Print Center.
4. On the TurboTax Print Center screen, select Print, save or preview this year's return.
5. On the next TurboTax Print Center screen, select 2019 federal returns and Include Government and TurboTax Worksheets (optional), then select View or Print Forms.
6. The information will be on the first page, Electronic Filing Instructions for your 2019 Federal Tax Return next to Balance Due/Refund.

@Ashton26

If you successfully filed your federal tax return through TurboTax this year, were expecting a refund and you also selected to have your refund via direct deposit you can view that information by following these steps:

1. Sign into TurboTax if you haven't already.
2. On the Tax Home screen, scroll down and select Add a State (don't worry, we're not adding a state) to access your tax forms and worksheets.
3. In the left menu, select Tax Tools then Print Center.
4. On the TurboTax Print Center screen, select Print, save or preview this year's return.
5. On the next TurboTax Print Center screen, select 2019 federal returns and Include Government and TurboTax Worksheets (optional), then select View or Print Forms.
6. The information will be on the first page, Electronic Filing Instructions for your 2019 Federal Tax Return next to Balance Due/Refund.
7. You can view the state refund information on the State Electronic Filing instructions.

Once your return has been accepted (or mailed), it's too late to change how you will receive your refund through TurboTax. If the information provided is for a closed or invalid account the government will mail you a refund check.