Review times don’t depend on your timezone. After the first two levels, the first review cycle will come aorund 4 hours after your lessons, then the next 8 hours after that, then 23 hours later and then 47 hours later.
The full behaviour can be read here: WaniKani’s SRS Stages | WaniKani Knowledge
The ultimate guide has some pointers on how to organize your day to get the most out of reviews.