Promise trouble! How can I write this in such a way that it waits for the end?

Trying to write this in a way that it will wait for the db operations to complete. Possible?

function addFriendsToSession(session, sessionId) {
    const friends = [];

    const incoming = session.users.forEach(async user => {
        console.log('user', user);
        await db
            .collection('users/' + user + '/settings')
            .doc(user)
            .get()
            .then(doc => {
                if (doc.exists) {
                    const returnObj = doc.data();
                    return returnObj.friends ? returnObj.friends : [];
                } else {
                    return [];
                }
            });
    });
    friends.push(incoming);
    return friends;
}