Maestral has been shown to run on Raspberry Pi but requires at least Python 3.6 while, as of this writing, Raspbian comes preinstalled with versions 2.7 and 3.5.
The latest version of Raspberry Pi OS, based on Debian Bookworm and released in October 2023, comes with Python 3.11; so this information is now outdated.
The Notes on Raspberry Pi page reads:
The latest version of Raspberry Pi OS, based on Debian Bookworm and released in October 2023, comes with Python 3.11; so this information is now outdated.