YVR Transborder?
My most recent data point is YVR to LAS on WS economy with no status for a 9:05am flight/8:25am boarding on a Thursday in late October last year. I was hoping to get to YVR just before 7am but ended up closer to 7:15am. Baggage drop off was a nightmare so I skipped and just carried on.
Separate security line through the side door for NEXUS was somewhat slow as they only had one lane going and a couple of flight crew pushed us back. Initially felt a little bit of panic as I joined the queue about 20 people deep just to the door along the outside wall and it wasn't moving very fast.
However, US immigration was super quick with NEXUS. Facial recognition and a short one person queue for a quick interview with the agent.
Got to the PP lounge around 8:10am based on timestamp message to the missus.