I am doing my taxes now. Can I apply for my 2nd payment of $600 and 3rd payment $1400 now?

[ljborn]

Do I get a 2nd stimulus check of $600?

[SweetieJean]

Did you get the 1st stimulus?  See below re eligibility for 2nd one.  The 3rd stimulus is not part of your 2020 tax return.  The IRS is paying those out separately. 

Are you eligible for a second stimulus check? These are the income limits | Fox Business

[Bsch4477]

When you get to the federal review you can reconcile your stimulus payments. The 3rd stimulus is handled separately. 

[DoninGA]

The third stimulus payment is sent by the IRS and not requested or reported on the 2020 tax return.

Go to this IRS website for get my payment information - https://www.irs.gov/coronavirus/get-my-payment

The first and second stimulus payments are reported on the 2020 federal tax return.  If you did not receive one or both payments they will be included on the 2020 federal tax return, if you are eligible to receive the Recovery Rebate Credit on the 2020 return, as a tax credit on Form 1040 Line 30.  The credit will be included in the federal tax refund or will reduce the federal taxes owed.