First you should check line 30 of your 2020 form 1040 you filed. That line is where you would find any missing stimulus payments from round one and/or two. (1200/600).
You will also need to check your bank and card statements to verify stimulus payments were not already sent to one of those accounts. (Jan 2021 to present). Also, if the IRS already sent the payments you will get letters from the IRS stating that. Use this link Q3 for steps to start a payment tracer action with the IRS.
Once your 2020 tax return is processed the IRS will be issuing any plus up payments for third round stimulus (1400). Here is a link you can use to check the status of that payment which will be sent separately from your tax refund.
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