How to check the status of automatic seeding in SQL Server

Automatic seeding for SQL Always On is nice, but in the case of big databases this can take some time. Of course, it can be annoying if something is running and you don't see the status of it. The query below will show you the status of the automatic seeding and the throughput.

IF OBJECT_ID('tempdb..#Seeding') IS NOT NULL DROP TABLE #Seeding;

SELECT  GETDATE() AS CollectionTime,
        instance_name,
        cntr_value
INTO    #Seeding
FROM    sys.dm_os_performance_counters
WHERE   counter_name = 'Backup/Restore Throughput/sec';

WAITFOR DELAY '00:00:10'

SELECT  LTRIM(RTRIM(p2.instance_name)) AS [DatabaseName],
        (p2.cntr_value - p1.cntr_value) / (DATEDIFF(SECOND,p1.CollectionTime,GETDATE()))/1024/1024 AS ThroughputMBytesSec
FROM    sys.dm_os_performance_counters AS p2
        INNER JOIN #Seeding AS p1
            ON p2.instance_name = p1.instance_name
WHERE   p2.counter_name LIKE 'Backup/Restore Throughput/sec%'
ORDER BY
        ThroughputMBytesSec DESC;