The blue bar just means the IRS is processing your return. Once they approve your return, they will issue you a refund. The IRS releases most refunds with some exceptions, within 21 calendar days after the e-filed return has been approved, not 21 days from the e-filing date.
You can track your refund here at Where's My Refund?. The IRS FAQ page will cover the details. This article should shed some light on the topic. When will I receive my refund?
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