Are you using any project management tool? Like Jira, Trello, etc. If not then start using one of them. Create tasks there, add your project manager in those tasks, keep updating those tasks or cards in terms of tags/labels. E.g. 'Scheduled' then 'On Going' then 'Done' etc. This will help your PM to get updated with each task's status and from his/her desk/cabin only. If PM has any query then s/he can simply add comments to those tasks and get reply from your team. It will be less interruptive and more productive. :)