IIRC, it becomes effective in late August.
https://www.koco.com/article/oklahoma-grocery-tax-bill-passes-senate/46906943
Oklahoma Senate passes grocery tax cut bill, which now heads to governor's desk
https://www.koco.com/article/oklahoma-grocery-tax-bill-passes-senate/46906943
Oklahoma Senate passes grocery tax cut bill, which now heads to governor's desk