The phrase "in nick of time" means just in time, at the last moment, or right before the deadline. Antonyms for this phrase would be early, ahead of schedule, premature, beforehand, or well in advance. These words imply that something has been done before the deadline or ahead of the expected time, which can bring a sense of relief or satisfaction to those involved. It is always helpful to complete your work beforehand rather than scrambling to get it done in the nick of time. Being ahead of time can also offer a sense of calm and control over the situation, making you feel more prepared and confident.