Update readme and fix tests.

Author: inelpandzic

README.md

@@ -299,7 +299,10 @@ The /status endpoint provides the current state of the PCSM replication process,
 
 - `lagTimeSeconds`: the current lag time in logical seconds between source and target clusters.
 - `eventsApplied`: the number of events applied to the target cluster.
-- `lastReplicatedOpTime`: the last replicated operation time.
+- `lastReplicatedOpTime`: the last replicated operation time
+- `lastReplicatedOpTime.ts`: op time timestamp
+- `lastReplicatedOpTime.isoDate`: op time ts in human-readable form
+
 
 - `initialSync.completed`: indicates if the initial sync is completed.
 - `initialSync.lagTimeSeconds`: the lag time in logical seconds until the initial sync completed.
@@ -318,7 +321,10 @@ Example:
 
     "lagTimeSeconds": 22,
     "eventsApplied": 5000,
-    "lastReplicatedOpTime": "1740335200.5",
+    "lastReplicatedOpTime": {
+        "ts": "1762241863.1",
+        "isoDate": "2025-11-04T07:37:43Z"
+    },
 
     "initialSync": {
         "completed": false,

tests/pcsm.py

@@ -233,7 +233,8 @@ def wait_for_clone_completed(self):
     def last_applied_op(self):
         """Get the last applied operation time."""
         status = self.pcsm.status()
-        if last_replicated_op_time := status.get("lastReplicatedOpTime"):
+        last_replicated_op_time = status.get("lastReplicatedOpTime", {}).get("ts")
+        if last_replicated_op_time:
             t_s, i_s = last_replicated_op_time.split(".")
             return bson.Timestamp(int(t_s), int(i_s))