When the chain is broken, there is no coupling of the aperture to the meter, so the meter is "flying blind". Your first roll is unfortunatley likely to be a disappointment.
I saved off the second photo and brightened the scene up considerably of detail in order to confirm that the meter coupling chain
is broken. When it is intact, it is a continuous chain line across the slit in which is resides, with the meter coupling pin attached. The coupling tab has set itself to the far right indicating a loss of connection.
This common breakage is not the end of the camera, but it should be repaired. Repair is somewhat involved and will require re-calibration of the lens mount (to reset focus accuracy) after it has been removed, and the chain has been replaced and tensioned (nowadays with flexible 'tiger-tail' beading wire, which is extremely strong and cannot easily be broken as the original copper alloy chain). In the absence of the working chain, you will need to use stop-down metering, preferably with a handheld meter to continue using the camera until repairs can be facilitated. You can even use the camera without the prism attached by focusing directly on the ground glass screen.
Photo confirming coupling chain breakage: