No. The ball isn't in touch untilIt's a windy day. The ball is kicked over the plane of touch, doesn't touch anything and is then blown back in. Is it in touch?
As someone who has fallen foul of this I can definitely say "don't blow your whistle until the ball touches something in touch!".
I once blew for touch after a ball kicked into touch from a penalty went about 30 yards over the line, over the heads of all the spectators.
Only to see it get caught by a gust of wind just as I blew, and bend back into play where it was caught by a defender. Half the players played on, half stopped.
Never did that again!