Hi dhanush,

Whether you have qualified jee mains and are  eligible for jee advance or not will depend upon whether you have crossed the cutoff marks declared by NTA officially. This cutoff will be different for different categories of students. As of now, the cutoff have not been declared and reportedly will be declared after the jee mains exam in April. So better wait for official results.

79.2  means that 79.2 percent people are behind you who gave the exam. According to your percentile your approximate rank will be 181889. This is not accurate and you should wait for the results.