Fantastic Photo! I estimate the comet to brighten to -6.5 to -7.0 at closest to the sun. It will be about -4 magnitude for Evening observers in the Northern Americas just North West of the sun about 5-7 degrees.
If this comet gets as bright as the moon I will be surprised. Nonetheless when near Christmas at its closest to Earth it will be a magnitude 5.0 which should be nice to see!