It depends.
Most likely since you have already filed your return you will receive the third stimulus payment if it is signed into law.
If you do not receive the 3rd stimulus payment then you might be able to claim it on your 2021 tax return.
As of now to be eligible for stimulus payments you need to be a U.S. citizen or U.S. resident alien in 2020 and have a Social Security number that is valid for employment.
You cannot be claimed as a dependent by someone else to be eligible.
It will be reduced if your 2020 adjusted gross income (AGI) is more than:
For additional information, please refer to the following link:
Watch the IRS site here for info on the 3rd payment : https://www.irs.gov/coronavirus/get-my-payment-frequently-asked-questions