We appreciate you writing in. Rush is available on selected Android devices which our product team tested and verified, we are working hard to support as many as we can. Please know that expanding device support is a top priority
You can refer to this page for Rush supported devices: https://helpx.adobe.com/in/premiere-rush/system-requirements.html
Also, please submit this request here. This forum is reviewed by the product team.
Let us know if you have any questions.