Unfortunately, the only way to make any updates is through the IRS site that you are currently using.
If the site is still indicating that you are eligible but hasn't yet given you a deposit or mail date, then I would continue to check the site. This would indicate that they have not yet processed your payment.
If your check is mailed to an old address it will be returned to the IRS (they will not forward checks) and once the return is logged into the IRS systems you may get the opportunity to provide your bank information in the IRS system (if they do not have it already.)
The site will remain open, and the IRS will be processing payments, throughout the rest of 2020.
Hopefully this will resolve for you within a few weeks but the worst case scenario is that you will be able to claim any funds you do not receive as a credit on your 2020 tax return when you file in 2021, increasing your refund then. It may not come to that, as you may receive the payment well before then - but as a last resort, you will get that option.
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