Passing those first two exams while in undergrad would be great. If possible you want to pass at least one before starting your junior year since most firms will be searching for interns that have at least one year of school left.
But if you really want to stand out above all your other peers, passing three exams makes you almost golden. Even if you don't have an internship but you have those three exams, it will make firms so much more interested in you.
All that I've said so far I'm passing down to you from what my program director told several of my classes.
Most firms will post in the job listings that they require at least one exam passed. I can tell you from personal experience that I had 0 exams passed after I graduated from the actuarial science program from UIUC that I got exactly 0 call backs from insurance companies. My gpa wasn't helping me either.
I've since decided to go for an applied stats masters and already in my first quarter I had companies calling me back for phone interviews for graduate internship programs. FYI don't bother with a strict actuarial science masters the material those classes cover is stuff you should be learning on your own. That's why I went applied stats. More emphasis on using programs and real world applications and data projects.