By the way,

本人是以J-1访问学者身份来美（

 

在美国大学里，美国这边不给钱所以没有雇佣关系

-Even though like that, your J-1 sponsor still can be considered as your current employer. So, you can ask the school to give you the employment letter for your I-485 filing if you still work there when filing I-485.