如何知道MATERIALIZED VIEW更新是否正在运行？

I'm talking about oracle. I have a few materialized views, and they're updated from time to time (it is done with a scheduled task). It is easy to know last refresh date - just query USER_MVIEW_REFRESH_TIMES. And is there any way to know if some views are being updated in the current moment?I'm talking about oracle. I have a few material