It depends. According to the main three requirements, you qualify.
1. You are a member of a recognized tribe (you seem to qualify on that point)
2. You work on the tribal land associated with your tribe (also checks)
3. You live on land associated as belonging to the tribe. (This you would need to prove)
It doesn't say specifically that you need to work for the Tribe in order to claim an exemption but you may wish to consult with a tax expert that is well familiar with this process. Working in your home on the land appears to qualify for the exemption.
Oklahoma asks for significant documentation on this as well. Please click on the following link: https://www.ok.gov/tax/documents/511Pkt-16.pdf and review the information on page 15, column1, under Exempt Tribal Income page 14.
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