Comet C/2021 A1 (Leonard) is currently visible in the southwest evening sky for a short period after sunset. Evening twilight makes it difficult to see the comet with the unaided eye. Even in binoculars it is a faint object. On the other hand, a short exposure on a camera will reveal the comet and its tail.
Finally, here is a time-lapse of the comet on 17 December 2021 from 18:16:48–18:21:08 MST. It moves quite a bit in just a few minutes.
Time lapse of the comet.
The comet will reach its highest elevation above the horizon this week and then begin to slowly drop towards the horizon again.