xssstate – display X screensaver state

$ xset -q | grep -EA2 '(Screen Saver|DPMS)'
Screen Saver:
  prefer blanking:  yes    allow exposures:  yes
  timeout:  600    cycle:  10
--
DPMS (Display Power Management Signaling):
  Standby: 720    Suspend: 0    Off: 900
  DPMS is Enabled
  Monitor is On

$ xdg-screensaver status
disabled

$ sleep 5; e=$(xssstate -t) && printf "%d\n" $(($e/1000))
595

$ watch -n1 -t 'e=$(xssstate -i) && printf $(($e/1000))'

$ grep Interfaces /usr/share/xdg-desktop-portal/portals/gtk.portal  | cut -d= -f2  | tr ';' '\n'
org.freedesktop.impl.portal.FileChooser
org.freedesktop.impl.portal.AppChooser
org.freedesktop.impl.portal.Print
org.freedesktop.impl.portal.Notification
org.freedesktop.impl.portal.Inhibit
org.freedesktop.impl.portal.Access
org.freedesktop.impl.portal.Account
org.freedesktop.impl.portal.Email
org.freedesktop.impl.portal.DynamicLauncher
org.freedesktop.impl.portal.Lockdown
org.freedesktop.impl.portal.Settings
org.freedesktop.impl.portal.Wallpaper