Do antipsychotics have a delayed onset of action similar to (monoamine) antidepressants?
There seem to be multiple studies generally pointing to a delay of clinical antipsychotic action of these drugs, typically between a week and two weeks (e.g.., Zedkova et al (2011) and Mousavi et al. (2013)). However, there is evidence that antipsychotics may start working after a day, or even within a few hours after starting the meds. See for an interesting review Agid et al. (2006).

From reading these papers my understanding is that a lot of it depends on where the researcher puts the threshold of clinical effectiveness and which outcome measure is used to define that effectiveness. 

References
- Agid et al., J Psychiatry Neurosci (2006); 31(2): 93–100
- Mousavi et al., J Res Pharm Pract (2013); 2(4): 138–44
- Zedkova et al., Neuro Endocrinol Lett (2011); 32(5): 667-70