They recently cleared a bunch of the trees to the right of the TRON billboard, so you can get a much better look at the construction site.
The giant piles of dirt are slowly dwindling, and you can see the concrete foundations to the right of that picture.
With the weather being so mild lately, the construction sites have been very active.
You can get a really good view from the queue of The Barnstormer, especially from the FastPass+ queue. This massive crane is visible from most areas in the back half of the park, too.
TRON Lightcycle Power Run is scheduled to open in 2021, just in time for the 50th Anniversary Celebration at the Walt Disney World Resort. Keep checking WDWNT for more updates!