It's already here and already at it's closest position today.
There is nothing to worry about, there never was.
It's a small 3 to 5 km wide lump of space debris made of ice, which is just like billions of its kind out there. Its distant orbit, which will bring it as close as 21 million miles from Earth! that alone also makes it too far away to exert an impact. In fact, even the magnetic field of the largest planet in the solar system, Jupiter, can only affect particles 7 million km away from it.
Give it a rest
You're full of ****