Both. You both want to ask how they're doing (giving them the chance to respond if they feel up to it) and just saying, "I hope your day is going okay." I wouldn't push too much, but in my experience (I've been through more major depressive episodes than I can count) it helps to hear that you're important to someone and also remind them that you're there if they want to talk or just get an ice cream or something. The key is not to push, it has to come from your friend's side.