According to Quartz, Amazon hired 120,000 seasonal workers in 2016 and 2017 vs. only 100,000 this year. Since consumer spending is up at the moment, this may be a sign of increased automation at their warehouses.
Now, given my own experience with Amazon Fresh, if they can find a way for a robot to inspect a bag of lettuce and make sure it isn’t rotten, it will be a great advance for robot-kind.