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 - 

https://www.irs.gov/newsroom/irs-begins-correcting-tax-returns-for-unemployment-compensation-income-...

https://www.irs.gov/newsroom/irs-sending-more-than-2-point-8-million-refunds-to-those-who-already-pa...

If the AGI on your return was below $150,000,

you qualify.

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 

https://turbotax.intuit.com/tax-tools/calculators/taxcaster/?s=1

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.