Sure.
Druids get access to a number of healing spells including Healing Word which is one of the best ones (Mostly because it only requires a bonus action).
However, it's worth noting that Healing is much less effective than damage prevention at keeping your party alive. Whereby having a dedicated healer is not as useful as having a character whom can impair (Or outright kill) enemies to prevent them from dealing damage in the first place.
There's nothing wrong with your noted party and Druid is a very capable support class. It's just something to keep in mind about utilizing the Druid. Focus less on the healing, and more on the spells that can harm enemies while having Healing Word in your pocket for touching up allies health.
