I haven't attempted to play chess for decades, but from what I remember, it sounds like the player with the white pieces has managed to get the pieces in line, ready for a series of moves leadiing to a quick check or checkmate.
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soheil1White has his arny ready to moveHe has prepared them and they are now ready.
Mister MicawberHe has prepared them and they are now ready.I'm sure this is more correct than my response.
soheil1What about "White has a ready-to-move army"?That is the meaning, yes.
soheil1Note that he is discuing open positions, And that there is no possibility of immediate chexkmate.White can just win a **** with accurate play ffrom Black.I don't think that this information is critical to the meaning.