Tax Topic 152 is related to refund timing. You can find more information about it here. Once the IRS has accepted your return, it then goes into processing status until they review and approve your return. Since it has been more than 21 calendar days since the acceptance of your return, you can try to call the IRS at 1-800-829-1040, but prepare for potentially long wait times.
Also, the IRS is experiencing delays in the processing of returns due to a later than usual start to the tax season, a backlog of mailed returns, current tax season returns, and the current round of stimulus payments. Please see this post here by ToddL99 for further explanation of why returns are delayed.
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