I actually plan to get there at the last minute, and often even check the wind forecast beforehand so I know if I’ll need a few extra minutes.
I seldom arrive more than 5 minutes away from my 8:30 start time.
There was a time that I was late every day, just like plenty of coworkers who drove cars to work. Since I was the only cyclist, I stood out and got to hear about it from management. Yay!