Я не знаю, что вы подразумеваете под 'версией плагина установлена ', но Справочный плагин Maven позволяет получить описание плагина, указав groupId и artifactId
mvn -Dplugin=<groupId>:<artifactId> help:describe
Вы получите подробное описание плагина - включая версию (хотя я должен признать, что не знаю стратегии разрешения номера версии).
Пример для подключаемого модуля maven-dependency-plugin
mvn -Dplugin=org.apache.maven.plugins:maven-dependency-plugin help:describe
выход
Name: Maven Dependency Plugin
Description: Provides utility goals to work with dependencies like copying,
unpacking, analyzing, resolving and many more.
Group Id: org.apache.maven.plugins
Artifact Id: maven-dependency-plugin
Version: 2.2
Goal Prefix: dependency
This plugin has 21 goals:
dependency:analyze
Description: Analyzes the dependencies of this project and determines which
are: used and declared; used and undeclared; unused and declared. This goal
is intended to be used standalone, thus it always executes the test-compile
phase - use the dependency:analyze-only goal instead when participating in
the build lifecycle.
dependency:analyze-dep-mgt
Description: This mojo looks at the dependencies after final resolution and
looks for mismatches in your dependencyManagement section. In versions of
maven prior to 2.0.6, it was possible to inherit versions that didn't match
your dependencyManagement. See MNG-1577 for more info. This mojo is also
useful for just detecting projects that override the dependencyManagement
directly. Set ignoreDirect to false to detect these otherwise normal
conditions.
dependency:analyze-duplicate
Description: Analyzes the <dependencies/> and <dependencyManagement/> tags
in the pom.xml and determines the duplicate declared dependencies.
... and much more