TK9Kscart to 3.5mm Jack socket adaptor 3.5mm socket audio out

Can you use this for a sony home sound system that did connect to sky hd via scart cabke but sky q does not have a scart openibg just an optical lead

can you mute the tv and still have audio in the headphones with this ?

I have a Bose speaker that uses 3.5mm Aux cable. Is it possible to redirect the sound to speakers using this adaptor?

Can this be used for a soundbar from TVs scart to soundbar 3.5?