I've found that Now has started automatically showing me the distance to my frequently visited places. I suspect this is because I've navigated to their location a few times on Google Maps, so Google knows this is a location I care about.
I'm guessing you've already set your home and work location in Google Maps? You could then also search for your other work location, and Now should automatically start prioritizing it later, especially if you pull up that card often.
By the way, you probably know this, but you can change how often different cards show up, and when they show up in the settings. For example, I've set weather to only show up in the morning and evening, so it doesn't clutter up my cards.
I'm guessing you've already set your home and work location in Google Maps? You could then also search for your other work location, and Now should automatically start prioritizing it later, especially if you pull up that card often.
By the way, you probably know this, but you can change how often different cards show up, and when they show up in the settings. For example, I've set weather to only show up in the morning and evening, so it doesn't clutter up my cards.