No official OrangeFox release yet for Poco X3 -- confirm at orangefox.download/.
Latest OrangeFox unofficial brigudav build for surya: R11.0_1.0-A10-Beta-surya released 2021-03-25 ('OrangeFox-R11.0_1.0-A10-Beta-surya.img'; download at androidfilehost.com/?w=files&flid=322792).