This week marked the nationwide rollout of mobile ordering at Starbucks. The process is pretty simple: Open the Starbucks app on your phone; order your drink from the nearest store; pay for it via the app; then head to the pickup counter and grab your pumpkin spice latte. The app also lets you know which store is closest and estimates when your coffee will be ready — most likely in 10 minutes or less. “Most of our customers don’t know about this yet,” one Rockville barista told us. “Once they figure it out, they’re going to be very happy to skip the line.”