How to check secondary is synced now or not

Question

there is the replica with three member (primary,secondary,secondary). Suppose one of secondaries down for a day, after return secondary back to replica how can i find, i

Answer 1

@arcseldon gave the right answer, however, rs.printSlaveReplicationInfo() will be depricated soon

rs0:PRIMARY> rs.printSlaveReplicationInfo() WARNING: printSlaveReplicationInfo is deprecated and may be removed in the next major release. Please use printSecondaryReplicationInfo instead.

So, start using rs.printSecondaryReplicationInfo() instead

rs0:PRIMARY> rs.printSecondaryReplicationInfo()
source: mongo-1.mongo.ns.svc.cluster.local:27017
        syncedTo: Sat Sep 26 2020 01:26:32 GMT+0000 (UTC)
        10 secs (0 hrs) behind the primary 
source: mongo-2.mongo.ns.svc.cluster.local:27017
        syncedTo: Sat Sep 26 2020 01:26:32 GMT+0000 (UTC)
        10 secs (0 hrs) behind the primary