The iRS is not mailing refund checks this year. They want you to have a direct deposit. If you do not have an account for a direct deposit, they will eventually mail you a check but your refund will be delayed for weeks.
https://www.taxpayeradvocate.irs.gov/news/tax-tips/direct-deposit-changes-for-2026-could-affect-how-and-when-you-get-your-refund/2026/01/