You can determine the status of the fulltext indexing by querying the indexing properties like this:
SELECT FULLTEXTCATALOGPROPERTY('IndexingCatalog', 'PopulateStatus') AS Status
Table Full-Text Populate Status
Displays the population status of the full-text indexed table.
The possible values are as follows:
0 = Idle.
1 = Full population is in progress.
2 = Incremental population is in progress.
3 = Propagation of tracked changes is in progress.
4 = Background update index is in progress, such as automatic change
tracking.
5 = Full-text indexing is throttled or pause