diff --git a/tools/power-utils/updater.cpp b/tools/power-utils/updater.cpp
index 024fabc..deab95f 100644
--- a/tools/power-utils/updater.cpp
+++ b/tools/power-utils/updater.cpp
@@ -69,11 +69,17 @@
         return false;
     }
 
-    // TODO: check if it is ready to update
-    // and return if not ready
-
     Updater updater(psuInventoryPath, devPath, imageDir);
+    if (!updater.isReadyToUpdate())
+    {
+        log<level::ERR>("PSU not ready to update",
+                        entry("PSU=%s", psuInventoryPath.c_str()));
+        return false;
+    }
+
+    updater.bindUnbind(false);
     int ret = updater.doUpdate();
+    updater.bindUnbind(true);
     return ret == 0;
 }
 
@@ -96,12 +102,6 @@
                         entry("ERROR=%s", e.what()));
         throw;
     }
-    bindUnbind(false);
-}
-
-Updater::~Updater()
-{
-    bindUnbind(true);
 }
 
 // During PSU update, it needs to access the PSU i2c device directly, so it
@@ -144,6 +144,20 @@
     }
 }
 
+bool Updater::isReadyToUpdate()
+{
+    // Pre-condition for updating PSU:
+    // * Host is powered off
+    // * All other PSUs are having AC input
+    // * All other PSUs are having standby output
+    if (util::isPoweredOn(bus))
+    {
+        return false;
+    }
+    // TODO
+    return true;
+}
+
 int Updater::doUpdate()
 {
     // TODO
diff --git a/tools/power-utils/updater.hpp b/tools/power-utils/updater.hpp
index 0d69c0b..befa4fb 100644
--- a/tools/power-utils/updater.hpp
+++ b/tools/power-utils/updater.hpp
@@ -54,7 +54,7 @@
             const std::string& imageDir);
 
     /** @brief Destructor */
-    ~Updater();
+    ~Updater() = default;
 
     /** @brief Bind or unbind the driver
      *
@@ -68,6 +68,12 @@
      */
     void setPresent(bool present);
 
+    /** @brief Check if it's ready to update the PSU
+     *
+     * @return true if it's ready, otherwise false
+     */
+    bool isReadyToUpdate();
+
     /** @brief Do the PSU update
      *
      * @return 0 if success, otherwise non-zero