diff --git a/training/sweep_reward.py b/training/sweep_reward.py
index b90c42a..0e0b819 100644
--- a/training/sweep_reward.py
+++ b/training/sweep_reward.py
@@ -34,30 +34,46 @@ from herding_env import HerdingEnv
 
 
 class ProgressCallback(BaseCallback):
-    """Print a one-line trial-progress summary every `freq` env steps."""
+    """Print a one-line trial-progress summary every `freq` env steps.
+    Tracks per-env returns and success directly from rollout rewards/infos
+    (no Monitor wrapper needed)."""
     def __init__(self, trial_id: int, stage_label: str, freq: int = 50_000):
         super().__init__()
         self.trial_id    = trial_id
         self.stage_label = stage_label
         self.freq        = freq
         self._last       = 0
-        self._ep_returns = []   # rolling list of completed-episode returns
+        self._ep_returns = []
+        self._ep_success = []
+        self._cur_ret    = None    # per-env running return
 
     def _on_step(self) -> bool:
-        for info, done in zip(self.locals.get("infos", []),
-                              self.locals.get("dones", [])):
-            if done and "episode" in info:
-                self._ep_returns.append(info["episode"]["r"])
-                if len(self._ep_returns) > 50:
-                    self._ep_returns.pop(0)
+        rewards = self.locals.get("rewards")
+        dones   = self.locals.get("dones")
+        infos   = self.locals.get("infos", [])
+        if rewards is None or dones is None:
+            return True
+        if self._cur_ret is None or len(self._cur_ret) != len(rewards):
+            self._cur_ret = np.zeros(len(rewards), dtype=np.float64)
+        self._cur_ret += np.asarray(rewards, dtype=np.float64)
+        for i, d in enumerate(dones):
+            if not d: continue
+            self._ep_returns.append(float(self._cur_ret[i]))
+            info = infos[i] if i < len(infos) else {}
+            self._ep_success.append(
+                int(info.get("n_penned", 0) == info.get("n_sheep", -1))
+            )
+            self._cur_ret[i] = 0.0
+            if len(self._ep_returns) > 50:
+                self._ep_returns.pop(0); self._ep_success.pop(0)
         if self.num_timesteps - self._last >= self.freq:
             self._last = self.num_timesteps
-            mean_r = (float(np.mean(self._ep_returns))
-                      if self._ep_returns else float("nan"))
             n_eps = len(self._ep_returns)
+            mean_r = float(np.mean(self._ep_returns)) if n_eps else float("nan")
+            sr     = float(np.mean(self._ep_success)) if n_eps else float("nan")
             print(f"           ... [trial {self.trial_id+1} | {self.stage_label} | "
                   f"{self.num_timesteps:>7,} steps | "
-                  f"ep_return(last {n_eps})={mean_r:+.2f}]",
+                  f"ret(last {n_eps})={mean_r:+.2f}  sr={sr*100:.0f}%]",
                   flush=True)
         return True