I'm not familiar with the Cairngorms but early/mid November is when I usually expect to see the first snow in the Gairloch/Torridon area.
A few years ago I walked up Baosbheinn (which is only few miles north of glen Torridon and close to Munro in height) in mid November and although there was snow it was soft, in small patches and no more than a few centimetres deep anywhere.
An ascent of Beinn Eighe, for example, via the Coire an Laoigh path would probably be OK and you can see the tops from the glen and decide if you feel happy about it.
However, given the much more variable weather in recent years almost anything could happen and my personal opinion is the geography of glen Torridon tends to channel the weather.
As WWW has said forecasts closer to the time are the best guide, both general and
https://www.mwis.org.uk/forecasts/scottishDave