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i guess you are using a MAXIMUM PERFORMANCE configuration without standby redo logs, where changes get applied only at log switches
show parameter log_archive_dest_N (use the approriate number that is representing the standby destination)
select protection_mode, protection_level from v$database;
select bytes from v$log;
select status from v$managed_standby where process='MRP0';
select recovery_mode from v$archive_dest_status;
select group#, thread#, status from v$standby_log;
You haven't posted the output of your second query.
My guess is that the Primary hasn't generated a new ArchiveLog in the last 50minutes -- so there is nothing to apply on the standby. You should be using ARCHIVE_LAG_TARGET to ensure that the Primary generates and ships a new ArchiveLog at a predetermined frequency.
Hemant K Chitale