If you are concerned about the status of your taxes and you are past the 21 day mark you should call the IRS to see if they can provide you with any additional information.
https://ttlc.intuit.com/replies/4495802
You will find the most current information on the IRS website.
https://www.irs.gov/refunds
See this information if your refund is taking longer to process:
https://ttlc.intuit.com/community/refunds/help/why-do-some-refunds-take-longer-than-others/00/26163