Are solar panel films for windows ready for the end users?
Photovoltaic windows are not commercially available. Most examples of this idea, including the SolarWindow to which you linked, are made of organic photovoltaic (OPV) materials. OPV is, compared to other PV technologies, in a very early stage of development. Laboratory cells still have quite low efficiency and very short lifetimes compared to more mature PV technologies.

The 3M solar films you linked to are barrier, backsheet, encapsulant and reflector films. They are made as components of solar panels and they do not produce electricity.