Question
Is Drush for Drupal supported in Plesk?
Answer
Drush is not supported in Plesk and is not planned to be implemented. It can be installed separately using instructions from the official website https://www.drush.org/ but support for it will not be provided by Plesk.
As this functionality is not implemented in Plesk yet, vote for a feature: Drush for Drupal
The top-ranked suggestions are likely to be included in the next versions of Plesk.