Super curious about this, I talked to my Tag Agent yesterday and still not certain about the physical tag yet.
I read through the bill which is now law. Signed by the Governor yesterday, 04/28/21!! Has an emergency clause so its in effect immediately.
Basic requirements are lights, turn signals, horn, windshield or eye protection. No DOT tire requirement.
I already been to the tag office. They weren't aware. They sent an email to the Oklahoma Tax Commission, (OTC) asking about it. For those that don't know in Oklahoma the OTC issues plates. Hope to hear something back today, 04/29/21.