You can track the status of your payment via the I.R.S.’s Get My Payment tool. Be aware that the volume of users sometimes overwhelms the site.
What should I do if I still haven’t gotten a payment from a past round of stimulus?
If you were in fact eligible to receive it, you can try to recover it through the so-called Recovery Rebate Credit when filing your 2020 return. Make your claim on Line 30 of Form 1040 or 1040-SR.