Printing current node workflow state name as the page body classes
I think once you get the node object in your preprocess function then you will be able to add the class. Body classes are only applied in template_preprocess_html so you can do the following,

function sattari_preprocess_html(&amp;$vars) {
  // If on an individual node page, add the node type to body classes.
  if ($node = menu_get_object()) {
    // debug($node);
    // Change as per your node object values added by workflow module.
    $variables['classes_array'][] = drupal_html_class('node-status-' . $node-&gt;status);
  }
}


For more reference have a look at template_preprocess_html