My 2020 taxes are still being processed after being accepted on Feb11. Will these taxes be used for 3rd stimulus being that its been accepted and being processed?

The IRS will use your 2020 tax information if your 2020 return has been processed otherwise they will use your 2019 information.

From the IRS: "The third round of Economic Impact Payments (EIP3) will be based on the taxpayer's latest processed tax return from either 2020 or 2019. If the IRS has received and processed a taxpayer's 2020 return, the agency will instead make the calculation based on that return".

"If you have an adjusted gross income (AGI) of up to $75,000 ($150,000 married filing jointly), you should be eligible for the full $1400 stimulus payment.  Payments will begin to be reduced for individuals making $75,000 or above in AGI ($150,000 for married filing jointly.) The reduced payments end at $80,000 for individuals ($160,000); people above these levels are ineligible for a payment"(IRS).

"Unlike the first two payments, the third stimulus payment is not restricted to children under 17. Eligible families will get a payment based on all of their qualifying dependents claimed on their return, including older relatives like college students, adults with disabilities, parents and grandparents" (IRS).

Please see How will the third stimulus impact me? for more information.