Siewz, that's good weight! If my bb is this size for first, I think I'll try induce.
For my dd2, she was 3.5kg when delivered & I chose to induce rather than wait. It took about 8hrs from induce till delivery. For my dd1, mayb first time so induce took longer time, around 14 hrs & dd was only 2.7kg.
Guess whatever your decision, have to be mentally prepared, as it depends on the situation then on how bb reacts to inducement.