You will most likely be observed during your training period. This is common in American classrooms with American teachers as well.
If at all possible, you should try to observe other teachers not only during your training period but throughout your teaching career in order to continually improve your skills.
You can expect to be observed through the duration of your teaching career. Though this might seem intimidating, it is actually a great way to improve on your teaching skills. To be more comfortable, make sure you are consistently well prepared for your lesson. Visit Oxford Seminars ESL Teaching Resources page for resources on teaching ESL.