Is the windows store for windows 8.1 gonna shut down after today?

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You can install new apps and games on a Windows 8.1 PC from Microsoft Store until January 10, 2023, and you can continue to use installed apps and games on a Windows 8.1 PC after that date. You will not be able to make any new app purchases or any in-app purchases after January 10, 2023. Installed apps and games will receive publisher updates through June 30, 2023 (or later if support is provided independently by the developer). After updates are no longer available, app quality and usability may be degraded. Customers who move to a Windows 10 or Windows 11 PC can use and reinstall previously purchased apps and games on their new or upgraded PC.

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> https://support.microsoft.com/en-us/windows/windows-8-1-support-will-end-on-january-10-2023-3cfd4cde-f611-496a-8057-923fba401e93

I've been confused on if it'll shut down today or after the end of support

We don't work for Microsoft and can not give you a date for that; but I doubt it will be in the near future.

It was another 3 years after 8 ended support before they shut the store for Windows 8:

Beginning in July 2019, the Windows 8 Store is officially closed. While you can no longer install or update applications from the Windows 8 Store, you can continue using those already installed. However, since Windows 8 has been out of support since January 2016,.

You will have to wait for Microsoft to announce what they will do about it.