One Piece at a Time

I hadn't heard anything about the Wall recently either, so I looked it up on Wiki.  The article is quite long, but you can just read the parts that interest you.

https://en.wikipedia.org/wiki/Trump_wa

It seems that the project is currently tied up in the courts, however:

"The White House petitioned to the Supreme Court, and on July 26, 2019, the Supreme Court, in a 5-4 decision, issued a stay to Gilliam's ruling, allowing wall and related construction to proceed while litigation continues. The funding comes from $2.5 billion of the military budget.^[c] The summary ruling from the majority indicated that the groups suing the government may not have standing to challenge the executive order.^[144] However, the plaintiffs will return to the Ninth Circuit Appeals Court.^[149]"

Another issue is that a substantial part of the Wall will need to be built on private or state owned land.  Some landowners are against it, but others have grown tired of waiting for the government to act and are building it themselves:  (Sorry about the gap, I can't seem to make it go away.)

Private efforts

We Build The Wall, a private organization founded by military veteran Brian Kolfage, raised over $23 million beginning in 2018, with President Trump's encouragement and with leadership from Kris Kobach and Steve Bannon. Over the 2019 Memorial Day weekend, the organization constructed a half-mile (800 m) "weathered steel" bollard fence near El Paso on private land adjoining the US
Mexico border using $6-8 million of the donated funds. Kolfage's organization says it has plans to construct further barriers on private lands adjoining the border in Texas and California.^[8][9]

Of course the Wall won't do much good as long as the current asylum laws are in effect.  I read some time ago on my news app that there is a stretch of existing barrier near El Paso, Texas that is set back from the border about a hundred yards because of the rough terrain.  Illegals have been stepping over onto US territory outside the fence and demanding that the Border Patrol come and arrest them.  The BP people actually open a gate, go through and arrest these people, then bring them inside for processing.  Most of them will eventually be released on the US side to await their hearing.  Sources differ about the percentage of them that actually show up, so believe what you will about that.