Hi Nicole,
You need to get the user ID first, and then use the helper function to get the image. This is a sample code you can start with:
$user_id = get_current_user_id();
$images = rwmb_meta( 'support-agent-profile', ['object_type' => 'user'], $user_id );
$image = $images[0];
echo "<img src='{$image['url'}'>";
You might want to change the code to get user ID if that's not the current user.