Adobe added the "Select Subject" feature to the new Photoshop app for iPad that was announced last month (the app can be downloaded here):
"This feature on the iPad works exactly the same as on Photoshop on the desktop and produces the same results, vastly enhancing selection capabilities and speed available on the iPad. With cloud documents, you can make a selection on the desktop or the iPad and continue your work seamlessly using Photoshop on another device with no loss of fidelity; no imports or exports required. We originally released Select Subject in Photoshop on the desktop in 2018. The 2019 version now runs on both the desktop and the iPad and produces cleaner selection edges on the mask and delivers massively faster performance (almost instantaneous), even on the iPad."
