I already got state check. Why is it taking so long for federal taxes?

[CassandraLO]

If it has been accepted, then you would wait for the approval from IRS. The refund process can take up to 21 

Are you receiving Earned Income Tax Credit (EIC) and/or Additional Child Tax Credit? The IRS will begin issuing tax refunds on returns with the EIC or Additional Child Tax Credit on February 27, 2019.

Other things that can delay your refund include but are not limited to:

• Liens, back taxes, or refund offsets;
• Errors, inconsistencies, or missing information;
• Identity fraud;
• Form 8379, Injured Spouse Allocation, which can take 11-14 weeks to process.                                                 You can track its status at the IRS Where's My Refund site

Please see the TurboTax FAQ's below for additional information:

Some 2018 federal refunds will be delayed due to the PATH Act

https://ttlc.intuit.com/replies/5556415

Where's My Refund

https://ttlc.intuit.com/replies/5340655