There have been 3 so far.
#1 was 1,200 (2,400 married) plus 500 for each dependent under 17.
#2 was 600 per person
#3 is 1,400 per person no age limit.
If you didn't get any of the first 2 or qualify for more you claim it on your 2020 tax return line 30 Recovery rebate credit.
The 3rd one comes separately and may still be going out. You do not claim it on your 2020 tax return.
IRS INFO
2020 Recovery Rebate Credit | Internal Revenue Service
