According to official Pure Storage documentation regarding Asynchronous Replication management, while replication throughput (bandwidth) can be viewed globally on the Analysis tab, the actual replication status for in-progress snapshot transfers is tracked and monitored on the replication target.
To monitor an in-progress asynchronous transfer from the GUI, a storage administrator must log into the target FlashArray, navigate to Storage -> Protection Groups, and look at the Transfers section within the Protection Group Snapshots panel. This view explicitly details the time the replicated snapshot was created on the source, the time the transfer started, and the current progress of the snapshot being received. If a transfer is currently in-progress, the "Completed" column will remain blank until the snapshot is fully safely written to the target array.
Here is why the other options are incorrect:
From the replication source (C): While the source orchestrates the creation of the snapshot and initiates the data push, the granular transfer completion status and historical transfer logs of the incoming snapshots are tracked on the target's Protection Group interface.
From the either the replication source or target (B): Because the specific "Transfers" tracking panel for asynchronous protection group snapshots is located on the receiving end (target), monitoring the granular completion status cannot be done symmetrically from either side in the UI.