To extract main points from the article, or: Why I Shared This Link:

the president has sought $25 billion from Congress to fund the project. (later +$5 billion more)

...lawmakers have not approved such funding. In 2017, the president managed to secure about $1.6 billion for border protection projects, but they are primarily for fortifying existing border fencing, not expanding the current wall.

"If you look at San Diego, illegal traffic dropped 92 percent once the wall was up. El Paso, illegal traffic dropped 72 percent, then ultimately 95 percent, once the wall was up. In Tucson, Arizona, illegal traffic dropped 92 percent. Yuma, it dropped illegal traffic 95 to 96 percent." -Trump

...

To date, the fencing is a hodge-podge of projects covering about 650 miles.

An aside from me: When you're lining the key border crossing points with the Military, these statistics are irrelevant. The military will be removed by the next immigration-friendly President. The next time there is a major financial crisis. The next time the military has to go to war for some major corporate donor, the MIC, Big Oil, or their "Big Brother" Israel. Troops on the border and 650 miles of barbed wire is not a permanent solution. Presidents come and go. Walls do not. Ask China.

In November, the government announced a $324 million contract for 32 miles of "primary pedestrian replacement wall" in Arizona.

A 20-mile border wall replacement project in Santa Teresa, N.M., was announced in April 2018. The cost is reported to be $73.3 million.

A 6-mile "levee wall system" is set for construction in Texas's Rio Grande Valley beginning in February 2019. It will cost $145 million.

A 14-mile "border wall construction project" along the border in San Diego was announced in June 2018. The project actually will replace an "eight-to-10 foot high scrap metal wall with an 18-to-30 foot bollard-style wall topped off with an anti-climbing plate." The cost will be $147 million.