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.
There is a delay in processing the returns as the IRS is not processing paper returns at the moment due to Covid-19 and social distancing policies in effect.
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Per the IRS website IRS Operations During COVID-19: Mission-critical functions continue: The IRS is not currently able to process individual paper tax returns. If you already have filed via paper but it has not yet been processed, do not file a second tax return or write to the IRS to inquire about the status of your return or your economic impact payment. Paper returns will be processed once processing centers are able to reopen.
If you mail a tax return (or a payment) to the IRS, it is a good idea to use a mailing service that will track it like UPS or certified mail so you will know it was received.
When you mail a tax return, you need to attach any documents showing tax withheld, such as your W-2’s or any 1099’s.
TurboTax will not know anything about your mailed return, and will continue to show “Ready to Mail” on your account. TurboTax will not know that you put your tax return in an envelope and took it to a mailbox. TurboTax does not get updates on mailed (or e-filed) returns.
When the IRS finally opens its mail and begins to process mailed returns you can check the status on the IRS site. https://www.irs.gov/refunds
State returns have to be mailed to the state.
There have been delays at the IRS due to staff shortages with the virus and the focus on launching the stimulus payments. The IRS actually quit processing returns for awhile. They are reportedly processing them again so hopefully yours will get processed soon.
All you can do is track the status of your refund at the IRS tracking web site:
See this IRS Q&A for how processing works: https://www.irs.gov/refunds/tax-season-refund-frequently-asked-questions