The IRS is recalculating refunds for people whose AGI is $150K or below and who filed before the tax law that changed the amount of unemployment that is taxable on a federal return became effective.
The IRS began to send out the additional refund checks for tax withheld from unemployment in May. The refunds are being sent out in batches—starting with the simplest returns first. If you are eligible for the extra refund for federal tax that was withheld from your unemployment the IRS will be sending you an additional refund sometime during the next several months. TurboTax cannot track or predict when it will be sent. The IRS has not provided a way for you to track it, so all you can do is wait for the refund to arrive.
Please read this very recent news from the IRS:
Q. How do I know if I should be expecting additional refund based on the (up to) $10,200 unemployment exclusion?
A. Prepare a test return with $10,200 less income and compare the result to the original return. You can use this tool
If your tax liability was already zero, it's unlikely that you will be getting more. But, it's possible, particularly if you become eligible for more EIC.