If you filed your tax return before the law was enacted then the IRS will automatically send the refund, if the adjustment did not affect other areas of your tax return. The IRS has been making adjustments on tax returns and issuing refunds. If you have not received your refund yet, the IRS has said that they will be sending refunds throughout the summer which doesn’t officially end until September 22nd.
Additional information can be found here: https://blog.turbotax.intuit.com/tax-news/am-i-eligible-for-the-new-unemployment-income-relief-49427/