fix(ddg): add get_shutter_delay method

csaxs_bec/devices/epics/delay_generator_csaxs/ddg_1.py

@@ -133,7 +133,7 @@ class DDG1(PSIDeviceBase, DelayGeneratorCSAXS):
         device_manager (DeviceManagerBase | None, optional): Device manager. Defaults to None.
     """
 
-    USER_ACCESS = ["keep_shutter_open_during_scan", "set_trigger"]
+    USER_ACCESS = ["keep_shutter_open_during_scan", "set_trigger", "get_shutter_open_delay"]
 
     # TODO Consider using the 'fsh' device instead.
     fast_shutter_readback = Cpt(
@@ -173,6 +173,10 @@ class DDG1(PSIDeviceBase, DelayGeneratorCSAXS):
         self._poll_thread_kill_event = threading.Event()
         self._poll_thread.start()
 
+    def get_shutter_open_delay(self) -> float:
+        """Get the current delay for the shutter to open."""
+        return self._shutter_to_open_delay
+
     # pylint: disable=attribute-defined-outside-init
     def on_connected(self) -> None:
         """