State doesn't have to be accepted in order for the federal to be approved. Federal may move right along and state still show in pending status since IRS doesn't handle the state return. If your state return gets rejected, that doesn't mean the federal will. They are processed individually by different entities. One doesn't affect processing of the other. IRS handles your federal return and your state handles the state return. You could very well receive your federal refund within 21 days and not have gotten state yet.
If your state return still shows pending, that is not uncommon, being that the IRS just officially started accepting e-filed returns on January 29, 2018. See below for more details on a state e-file still pending.
And if your federal has been accepted by the IRS already, please allow 24-48 hours after they accept and then start tracking it on their website to see when it moves to approved. To check the status of your federal tax refund, go to Where's My Refund? at IRS.gov.
Why is my state e-file still pending?
https://ttlc.intuit.com/replies/3302294
