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@waxwing: silly me, I meant 'in the (affirmative) present simple'.

@vsem: Now I'm not saying it's wrong grammatically, it just sounds strange.

No it wouldn't. It sounds odd. You'd just say 'yes, I am'. In affirmative sentences you don't use 'already' that often. You could say 'I've already been ready for some time now, but I was waiting for...