First, if we do it probably won't be $2000 on top of the $600. It sounds like they want to give out an extra $1400 to bring the total of payments up to $2000.
Second, the people most in charge of this are Sens. Joe Manchin (D) along with maybe Susan Collins (R) and Lisa Murkowski (R). They are the most middle votes in the Senate right now, and at least one of them has to agree to $1400 checks in order for it to happen. If all of them refuse to vote for that, we don't get it. And Joe has stated he is iffy about it, so if we lose his vote we need one of the Republican ladies to step up.
If we do wind up getting it, how will that work? Well it could go a couple of ways. If they do it fast enough, like right after Joe Biden gets inaugurated, they could just make it a credit on your 2020 tax return and get it to you that way. But I'm guessing it will take longer than that. In that case, they will do like they did before, and either direct deposit the money or mail out checks. So to prepare for that, make sure the IRS has your current address, fill out a change of address form at IRS.gov if you need to. When you file your taxes, provide your DD info even if you owe if you file early enough to get the check that way. We just want to avoid your check getting mailed to an address you aren't at anymore!