JWTW

2 outs, runner on 3rd, ball is hit into play. Runner on 3rd advances home where catcher NOT in possession of the ball is standing on the 3rd base line about 1’ from home plate. Runner avoids the catcher entirely but fails to tag home in doing so. Catcher then catches throw to home and tags runner while he attempts to reach back and tag the plate after missing on the way by. Runner is called out. Is this obstruction?