This doesn't surprise me if you mailed your return. It is likely to be many more weeks with the backlog of mail the IRS has. There is a delay in processing the returns as the IRS is not processing anything paper at the moment due to Covid-19 and social distancing policies in effect.
IRS operations
The online link is your best option to track your refund. I have attached a link with more answers from the IRS as to why your refund may be taking longer to process.
Federal refund questions
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