This is normal, the IRS letting you know they do have your return and are working on it. The IRS expects most tax payers to receive their refund in 21 days from the date it was accepted.
If your return was accepted less than 21 days ago, hang in there. It can take anywhere from a few days to 3 weeks to go from acceptance to approval. This time frame is unrelated to how, where, or when you filed and it isn't connected to how quickly you got your refund last year.
For more info about Where's My Refund and other refund-related topics, visit the IRS webpage Tax Season Refund Frequently Asked Questions.
According to the IRS on taxpayers claiming Earned Income Tax Credit or the Additional Child Tax Credit- https://www.irs.gov/pub/irs-pdf/p2043en.pdf
Claiming the Earned Income Tax Credit or the Additional Child Tax Credit
If a taxpayer is claiming the EITC or the ACTC, they can file
their return any time after the filing season begins. However,
by law, the IRS cannot issue refunds before mid-February for
tax returns that claim the Earned Income Tax Credit (EITC) or
the Additional Child Tax Credit (ACTC). Keep in mind that only
a small percentage of total filers will fall into this situation.
While the IRS will process taxpayer returns when they are
received, it cannot issue related refunds before mid-February.
The IRS expects the earliest EITC/ACTC related refunds to be
available in taxpayer bank accounts or on debit cards starting
on Feb 27, 2019, if they chose direct deposit and there are no
other issues with their tax return.
Some 2018 federal refunds will be delayed due to the PATH Act
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