Not to worry. Doesn't mean much just yet.
They may just need additional information from you or your employer,etc.the IRS may simply need more time to work on the return.
If they need more information they will send you a letter. You can always call them. 1-800-829-1040
Use this link to keep track:
There are a few ways you can
track your tax return.
From
<https://ttlc.intuit.com/questions/4170025-how-do-i-track-my-income-tax-return>