Sorry that is NORMAL this year. Especially for mailed returns. Millions are still waiting. Hope it didn't mess you up by mailing it again. That usually delays it even more. Did you get a tracking number from the post office when you mailed it so you know if they got it?
Does it show up yet at IRS Where's my refund
https://www.irs.gov/refunds/
When will you get your refund?
https://ttlc.intuit.com/community/refund-status/help/when-will-i-get-my-irs-tax-refund/01/25589
IRS - Questions about Refunds
https://www.irs.gov/refunds/tax-season-refund-frequently-asked-questions
