Render updated node data during views render
Assuming this is Drupal 7. 

hook_preprocess_views_view() runs after the query is performed. You could try using hook_views_pre_view() or hook_views_query_alter(), both of which happen before the query runs, and save the nodes at that time. Of course the results of the view will not be available to you then, so you would have to select the nodes in some other way. 

Also neither of these hooks work in themes, you would have to use a custom module. 

https://api.drupal.org/api/views/views.api.php/group/views_hooks/7.x-3.x