Store the largest _id value from the oplog entries applied from that donor shard in the config.localReshardingOperations.recipient.progress_applier document as the <progress {clusterTime, ts}> for that donor shard.

{
    _id: <donor's shard ID>,
    progress: <donor1's progress {clusterTime, ts}>,
}

The largest _id value from the oplog entries applied from that donor shard should be used with {$match: {_id: {$gt: <progress {clusterTime, ts}>}}} to resume.

When the donor shard's final oplog entry marker is applied, the config.localReshardingOperations.recipient.progress_applier document can be updated to store {_id: MaxKey} as an indicator that resuming is no longer necessary.