Federal and state tax returns are processed by 2 separate entities so one being processed before the other is a usual occurrence. Once accepted and approved, you may use the link below to check the status of your federal refund.
https://www.irs.gov/refunds
Additionally, the following link provides helpful information on estimated federal refund due dates based on date of filing: https://www.cpapracticeadvisor.com/tax-compliance/news/21123770/chart-shows-estimated-irs-income-tax-refund-dates-for-2020