You might have to wait and be agonizingly teased for an additional three months until those LCD, screens telling you the arrival of the next train, start to work. Curbed LA reported it would be by May and now Streetsblog LA reports by the end of June the latest and tells us how they will work:

Until the train is close to the station, the screens will update information based off the schedule. Once the train is five minutes away, there will be a regularly updated countdown clock until train arrival. The monitors will also say whether the inbound train is a Red or Purple Line train.

Currently the Orange Line has "next bus" arrival information, but sometimes it's very wonky (such as "next bus arrives in 22 minutes," but it is actually a minute away). A few Metro Rapid lines also have these at stations on major boulevards such as Ventura and Wilshire. They work well... when they are working that is.

Earlier:
-- Gas at All Time High; Metro Looking to Cut Service
-- 20 Bus Lines on the MTA's Chopping Block

Photo by Zach Behrens/LAist