Distribution Agents that are actively distributing transactions

The following query will pull all information about distribution agents that are actively distributing transactions (in progress) and will provide useful information such as the delivery rate (txs/sec).

SELECT      da.name, da.publisher_db, da.subscription_type,
            dh.runstatus, dh.delivery_rate, dh.start_time, dh.duration
FROM        dbo.MSdistribution_history dh WITH (NOLOCK)
INNER JOIN  dbo.msdistribution_agents da WITH (NOLOCK)
ON          dh.agent_id = da.id
WHERE       dh.runstatus = 3
AND         dh.start_time BETWEEN DATEADD(dd,-30,GETDATE()) AND GETDATE()
ORDER BY    dh.start_time DESC

More On :- http://www.mssqltips.com/sqlservertip/2853/troubleshooting-sql-server-replication/