Yes there is a 3rd Stimulus payment of $1,400 per person. The IRS sent them out starting in March 2021 based on your 2019 or 2020 return. It gets reconciled on your 2021 return line 30 as the Recovery Rebate Credit.
If you didn't get the full 3rd Stimulus payment in 2021 based on your 2020 income or qualify for more, you will get it on your 2021 return line 30 Recovery Rebate Credit if you qualify based on your 2021 income. See IRS question 2 here,
2021 Recovery Rebate Credit — Topic C: Eligibility for claiming a Recovery Rebate Credit on a 2021 t...
To get to the stimulus questions in TurboTax at any time, you can search for stimulus or recovery rebate credit then hit ENTER and there should be a Jump to link
If you are trying to trigger it,
Click on Other Tax Situations at top
Click on Let's get started
Answer some questions then Continue
Then click on Let's keep going
Next screen is for the Third Stimulus, if you qualify
