The snow line in the south will initially be a little higher, at 1500 to 1600 m, but will then drop to 1200 m with the onset of precipitation in the south, or even lower if there is heavy precipitation on Friday evening. In the south-east, i.e. towards Veneto and Slovenia, this will last until Saturday. In the north, most of the precipitation will only fall with the arrival of the cold front on Friday evening anyway, so most of it should come as snow above 800 to 1000 m there. Before that, it will be foehn and warm there.
The amounts: As befits a südstau, most of it should come in the south. But the question is where, because strangely enough it's only a small hotspot in the models and the rest will get significantly less.
In the south from Monte Rosa to Slovenia, 50 to 90 cm of snow should fall, although it could be a little less in South Tyrol and the surrounding area if you believe the models, as there is a gap between the core zones.
In the western core zone from Ticino, Upper Engadine to Adamello it will be significantly more than that and the magic meter will certainly be cracked here! Here, 100 to 120 cm of snow will fall across the board and in one or two reservoirs it could even be 150 cm.