Replication to MySQL and Amazon based instances operates in the same manner as all other replication environments. The current status can be monitored using trepctl. On the Extractor:

shell> trepctl status
Processing status command...
NAME                     VALUE
----                     -----
appliedLastEventId     : mysql-bin.000043:0000000000000291;84
appliedLastSeqno       : 2320
appliedLatency         : 0.733
channels               : 1
clusterName            : alpha
currentEventId         : mysql-bin.000043:0000000000000291
currentTimeMillis      : 1387544952494
dataServerHost         : host1
extensions             : 
host                   : host1
latestEpochNumber      : 60
masterConnectUri       : thl://localhost:/
masterListenUri        : thl://host1:2112/
maximumStoredSeqNo     : 2320
minimumStoredSeqNo     : 0
offlineRequests        : NONE
pendingError           : NONE
pendingErrorCode       : NONE
pendingErrorEventId    : NONE
pendingErrorSeqno      : -1
pendingExceptionMessage: NONE
pipelineSource         : jdbc:mysql:thin://host1:13306/
relativeLatency        : 23.494
resourcePrecedence     : 99
rmiPort                : 10000
role                   : master
seqnoType              : java.lang.Long
serviceName            : alpha
serviceType            : local
simpleServiceName      : alpha
siteName               : default
sourceId               : host1
state                  : ONLINE
timeInStateSeconds     : 99525.477
transitioningTo        : 
uptimeSeconds          : 99527.364
useSSLConnection       : false
version                : Tungsten Replicator 7.1.4 build 10
Finished status command...

On the Applier, use trepctl and monitor the appliedLatency and appliedLastSeqno. The output will include the hostname of the Amazon RDS instance:

shell> trepctl status
Processing status command...
NAME                     VALUE
----                     -----
appliedLastEventId     : mysql-bin.000043:0000000000000291;84
appliedLastSeqno       : 2320
appliedLatency         : 797.615
channels               : 1
clusterName            : default
currentEventId         : NONE
currentTimeMillis      : 1387545785268
dataServerHost         : documentationtest.cnlhon44f2wq.eu-west-1.rds.amazonaws.com
extensions             : 
host                   : documentationtest.cnlhon44f2wq.eu-west-1.rds.amazonaws.com
latestEpochNumber      : 60
masterConnectUri       : thl://host1:2112/
masterListenUri        : thl://host2:2112/
maximumStoredSeqNo     : 2320
minimumStoredSeqNo     : 0
offlineRequests        : NONE
pendingError           : NONE
pendingErrorCode       : NONE
pendingErrorEventId    : NONE
pendingErrorSeqno      : -1
pendingExceptionMessage: NONE
pipelineSource         : thl://host1:2112/
relativeLatency        : 856.268
resourcePrecedence     : 99
rmiPort                : 10000
role                   : slave
seqnoType              : java.lang.Long
serviceName            : alpha
serviceType            : local
simpleServiceName      : alpha
siteName               : default
sourceId               : documentationtest.cnlhon44f2wq.eu-west-1.rds.amazonaws.com
state                  : ONLINE
timeInStateSeconds     : 461.885
transitioningTo        : 
uptimeSeconds          : 668.606
useSSLConnection       : false
version                : Tungsten Replicator 7.1.4 build 10
Finished status command...