poised to (do something)
Braced, prepared, or ready to do something in the immediate future. We were all poised to work long hours to finish the project in time for the holidays. The cobra reared its head up with its hood flared out, so I knew it was poised to strike.
poised to do something
ready to do something; in the right position to do something. The cat is poised to jump on the mouse. The army is poised to attack at dawn.