The IRS does not send acknowledgement letters to tax filers. You can check the status of your federal refund using the IRS tracking web site: https://www.irs.gov/refunds
The IRS states that nine out of 10 e-filed tax returns with direct deposit will be processed within 21 days of IRS e-file acceptance. Mailed paper returns: If you filed a paper return, please allow 4 weeks before checking the status. Refund processing time is 6 to 8 weeks from the date the IRS receives your tax return.
You can checked the IRS website Where's My Refund for your information?
Also, see the following from the IRS for refund information.
2020 Income Tax Refund Chart Shows When You'll Get Your IRS Refund
https://www.cpapracticeadvisor.com/tax-compliance/news/21121511/2020-income-tax-refund-chart-shows-w...
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To check on a State refund, click on the following link, then click on your State
https://ttlc.intuit.com/community/refund-status/help/how-do-i-track-my-state-refund/00/25571