As of the time of this post, the current SPOS version is 9.3.2.
You can always check via: System settings – updates Tab – click ‘check & download’. This way the system will show if SPOS is up to date.
SPOS has multiple checks “underwater” to check if users are on the latest version. Otherwise, this will be mentioned on your SPOS screen (for example; when updating for forecast weather.)