Given your situation, you'll be able to get the $1200 credit from the CARES Act on line 30 of your tax return. It's the one labeled "Recovery rebate credit".
Depending on how this new HEALS bill is worded, you may be able to also get the $600 credit on that same line of your tax return, so in your case line 30 might end up being $1800 ($1200 CARES Act plus $600 HEALS Act).
What I meant by the last sentence is that these credits are structured to where people get them one of two ways: either in advance, based on their 2019 or 2018 tax information, or when they file their 2020 tax return. They did the advance thing so that the money would get out into the economy faster.
For people whose tax situation did not change between 2018/2019 and 2020, they'll get the credit in advance and it will be the amount they should have gotten and line 30 will be a zero.
For people whose tax situation changed between 2018/2019 and 2020, if their credit went up they'll get an additional amount on line 30 to make them square - so if you were entitled to $100 based on your 2018/2019 situation and $500 on your 2020 situation, you'd get the additional $400 on line 30.
For people who got an advance payment based on their 2018/2019 situation that was higher than what they should have gotten based on their 2020 tax situation, they won't have to pay back the extra. Line 30 would start off looking like it should be negative, but the IRS instructions and tax law won't let it go below $0.
Most people talk about the credits as though they're binary, as though you either get $0 or you get $1200. But there are income phase out ranges so in fact people could get any amount in between.
ETA: You could also just read this article here, which looks like it does a good job of explaining it all:
https://www.forbes.com/sites/kellyp...ovid-related-stimulus-checks/?sh=50829e8d5c1b