6/3/20 Summary: Border Wall links
U.S./Mexico Border Wall updates can be hard to obtain. This page has several links I have found to be useful and a table listing the weekly updates on the border wall from 10/7/19 to the most current update on 5/24/20. Here you can see the overall speed of construction of the border wall and how it has accelerated.
Note about today's newly released Border Wall progress update.
Over the last few months the average progress is about 1 mile per day. Today, 6/22/20, marks the lowest Pre-Construction number at 183 miles and highest number of miles of border wall being actively built at 339.
Revised to add a short introduction that describes the border wall with pictures (I expect this will be modified and updated often for a while), reversed the list order for the border wall updates so that the most recent weekly update is listed first, and redesigned the page somewhat for readability.