In theory, although it would take an infinite amount of time to do so. From Earth it would just get redder and dimmer - when we couldn't see it anymore it woul

In theory, although it would take an infinite amount of time to do so. From Earth it would just get redder and dimmer - when we couldn't see it anymore it wouldn't be a black hole yet, but it would be hard to see the difference. (Especially surrounded by the accretion disc.)