Zermatt - when do they open Stockhorn?

Just a question for those who have skiied Zermatt in recent years:

I'm headed there next week, and there's some terrain that I'm
particularly interested in - the black runs underneath the Stockhorn.

I've been keeping an eye on their website and the Stockhorn lift has
not opened so far this season, and the black runs like Triftji remain
closed.

Now I'm aware that they need a fair amount of snow to open this part
of the mountain, but it seems there's quite a lot of snow there at the
moment.

Anyone know when they normally get this area opened up in a normal
season?


Thanks