I've got the impression that spectroscopic methods that would be able to detect the major composition of the atmospheres of exoplanets at 10–100 light years awa

I've got the impression that spectroscopic methods that would be able to detect the major composition of the atmospheres of exoplanets at 10–100 light years away, are almost around a corner now. Maybe in 10 years? Then if we find a planet with an atmosphere that is far from the thermodynamical equilibrium, like our 21% oxygen is because of photosynthesis, then that might be a planet with planetary scale life.