Can I get my third stimulus check in my federal return

[SweetieJean]

No.  This one comes to you separately (and automatically), not as part of your 2020 tax refund.   The IRS is sending out Stimulus #3 payments in batches, and will take a few weeks to complete them all.   You can check the status here:

Get My Payment | Internal Revenue Service (irs.gov)

[DoninGA]

No, the third stimulus is not part of your 2020 federal tax return.

The IRS sends the third stimulus payment directly to you - https://www.irs.gov/coronavirus/get-my-payment