It seems unlikely that you received an adjustment from the IRS since they only made the official announcement today that they would be re-processing UEC tax returns starting in May. Although it's certainly possible they did some secret tests to make sure it worked before making the announcement. If the IRS adjusts your refund, they should also send a letter, did it arrive yet?
https://www.irs.gov/newsroom/irs-to-recalculate-taxes-on-unemployment-benefits-refunds-to-start-in-m...
It appears that Michigan is a "conforming" state, that means that they accept the IRS definition of "income", so the federal exclusion for UEC will also reduce your state taxable income. However, this seems to ask you to wait until the state can analyze the IRS decision.
https://www.micpa.org/stay-informed/news/2021/03/24/breaking-news-michigan-department-of-treasury-pr...
If you need to file a Michigan amended return, that would mean preparing both a federal and state amended return in Turbotax (because that's how the program workflow works) but only filing the state return (because the IRS will make the adjustment for you.). But I think I would wait a few more weeks to see if the state makes any different announcement.
