TurboTax is not connected to the IRS or state department(s) of revenue refund tracking tools. We don't receive real time updates from the IRS. The IRS releases most refunds within 21 calendar days after the e-filed return has been accepted (received), not 21 days from the e-filing date. If accepted by the IRS, you can check your refund status below:
https://www.irs.gov/refunds
Additionally, the following link provides helpful information on estimated 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