Go to this IRS website for unemployment compensation exclusion FAQ's - https://www.irs.gov/newsroom/2020-unemployment-compensation-exclusion-faqs
And these IRS websites for more information concerning the tax refund for the exclusion -
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.