Well, Michigan says to allow two weeks from the date you received confirmation that your e-filed state return was accepted before checking for information. I know you're beyond that, but the state might not update every day, so you could be between cycles. And right now (6:40 pm Eastern time, Sunday, 2/28/2021) the site says this:
We are currently experiencing intermittent system issues, resulting in a delay of updated refund information. This includes the automated voice response system and e-services. We are working to resolve the problem. We apologize for any inconvenience this may cause.
Taxes - Income Tax Self-Service (michigan.gov)
