Unless you were already receiving WS alerts prior to 80/100kts, you won’t receive an alert until after you are in the air.
I think that is correct.
The way I think about it is that if I hear the word Windshear from the machine while taking off I am stopping. ( because it’s a warning). If I hear the words ‘monitor radar display’ then I am probably stopping, not definitely, but probably.
With either of them I expect I will be either in the low speed regime or only just entering the high speed regime.
Happy to hear others thoughts on the subject.