I am enrolled in an accredited program in Minnesota.
The simple answer is NO.
According to the OT Practice Framework the occupational therapist develops the plan. The OTA, based on established competencies and under the supervision of an OT, may contribute to the plan's development. You state in your question that you have no established competencies, so you would not be able to independently create goals and implement treatment. You will have to collaborate with your supervising OT.