A good number of videos out there, but they aren’t compiled...that is to say “where are we to date on completion or progress?”
My take on it is that it IS being built, but in chunks and those chunks are covering the stretches where the “existing” barrier is poor to nearly non existent.
Here’s a vid of a new section at Santa Teresa NM.
Here’s a much better video of the barrier. This was posted in mid-October 2018.