Just going to say... WOAH! But I don't believe they're going to finish it until tonight for two reasons. 1, notice the position of the crane. It's been lowered to it's resting position. 2, when it's cooler at night, it's more optimal to install the track as heat makes the metal expand during the day and it would be very difficult to make it fit together, especially that far off the ground. Bonus reason... They won't have thousands of people congregating and not social distancing during the final section install. But it wouldn't stop them assembling the final section during the day. You'll definitely see activity today.