Yes, you can paper file your OK return. The OK Tax Commission has stated that if you e-file your return, the due for such return is April 20, 2022. Additionally, the OK Tax Commission has stated that if you paper file a return which reflects a refund, you will need to allow four to six weeks before checking on the status of that refund.
Here is a link to the OK Tax Commission's Instructions for Resident returns which you might find helpful.
OK Tax Commission Instructions for Resident Income Tax Forms
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