The students' activity minutes are only used as an activity metric---the amount of time they spend practicing does not directly have any effect on their Course Mastery Goal progress or percentage. To learn how students can level up skills and increase their mastery percentage, please see this article.
To view how much time students have spent practicing on Khan Academy, you can use the Activity Overview report. To monitor mastery progress, you can use the new skills report on the activity overview tab.
If you're new to Khan Academy, I suggest starting with our Khan For Educators course. This course explains everything you need to know to get your account set up and to start using the assignments and reporting tools!
I hope this helps! Please let me know if there's anything else I can do for you!
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