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Finally got the answer:
Click hyperlink for "Expected Timeline for Economic Impact Payments", read the section titled "Additional rounds"
Great find Will. So here's the exert. This really does give clarity on this situation:
Individuals can provide their direct deposit information by using one of the two IRS portals: (1) Get My Payment (for tax filers who did not provide direct deposit information on their 2018 or 2019 return) and (2) Non-Filers: Enter Payment Info (for individuals who are not required to file tax returns). Individuals who enter their direct deposit information into the portals by Thursday of a week reportedly will be paid the following week. Also, taxpayers expecting a tax refund for 2019 can provide their direct deposit information to the IRS by filing a 2019 federal income tax return if they have not already done so in lieu of using the Get My Payment portal.
The highlighted sentence is the important one. So if you update your information by Thursday during the week, you should be paid the following week. So for everyone that used the portal to update their bank info on 4/15 or 4/16, you should get your stimulus sometime next week, even if you didn't get any confirmation.
From reading that, if you update your info from Friday, 4/17 to Thursday 4/23, it will be deposited the week of 4/27 - 5/1. And so on and so on.
But they will also start sending out paper checks the week of April 20th, so be sure to update before your check goes out if you would rather a direct deposit:
Beginning the week of April 20, the IRS also will begin issuing paper checks on a weekly basis to individuals who have not provided direct deposit information but for whom IRS has a mailing address. Paper checks will be issued at a rate of about 5 million per week, which could take up to 20 weeks. The checks will be issued in reverse “adjusted gross income” order—starting with people with the lowest incomes first.
You can also check the timetable of stimulus checks being mailed out on our Stimulus Timetable thread.