My daughter cried every morning, 4 days a week, when I dropped her off at preschool. It was on-campus at the college I was attending, and she cried everyday for 4.5 months, the entire semester. The teacher didn't tell me each day how long she'd cried, but reassured me from time to time it was completely normal, preschools are used to it. My daughter was off for 5 weeks between semesters and never cried again when we returned in January.
Having worked in a preschool myself and going by what you said, that he started preschool 2 weeks ago, his behavior sounds normal and that may be why it hasn't been mentioned to his mom. We didn't give "daily reports" but would say something like, "He had a great day!" or "Today wasn't the best, tomorrow should be better" and the parent was free to ask for specifics. We also had a chart for everyone to see and if the color was orange or red parents knew something negative had happened, but we wouldn't have a child on orange or red for crying.
If his mom wants daily reports she should ask his teacher the best way to get them, mindful that her son is not the only student and that she needs to work around what is also best for the teacher. She also should ask him every day how his day went, what he did, and if he indicates he cried ask him why, and reassure and encourage him as best she can, she is is cheerleader. It may take some time, particularly if he isn't used to being away from her and home, but if he's encouraged to have fun in school he eventually will.