In the below script, you can add a filter of your database and table for getting the number of Forwarding Records.
SELECT
OBJECT_NAME(object_id) as TableName
,index_type_desc
,page_count
,avg_page_space_used_in_percent
,avg_record_size_in_bytes
,forwarded_record_count
FROM sys.dm_db_index_physical_stats
(
DB_ID('database_name')
,OBJECT_ID('table_name')
,NULL
,NULL
,'DETAILED'
)