Hi kutagull,
Thank you for your note -- congratulations on the nice GPA and kudos to you for planning ahead!
From a stats perspective, more is going to be better with respect to the GMAT and GPA. Your GPA lines up nicely, but if you can continue to grind your away above the median, that will only be additive. Likewise on the GMAT front. You can see the class profiles up on the sites. A 730 GMAT (the median for HBS's 2+2) would be better than the 710/720 you mentioned, and if you can muster your away north of 730, well that's even better.
Beyond the stats, I encourage you to really try to differentiate yourself over the next couple of years in line with what you read on HBS and Stanford's sites for these programs. There is an "above and beyond" element to each, and that "above and beyond" element will generally need to manifest in a variety of areas (academics, leadership, community, languages, research, and career). Develop and refine your career goals. Pore over the literature and consider how exactly you'd satisfy some of the de facto requirements AND how you can achieve that "next level" in the aforementioned areas. I find that trying to structure them into categories and then identifying goals and steps in each is more effective than a haphazard approach. Deep in those key areas is better than light in a million.
Stanford provides even more specific advice, citing recommended courses, steps to consider, and advice around second-language fluency:
https://www.gsb.stanford.edu/programs/m ... enrollmentBoth are hyper-competitive programs. Thinking ahead is a great start. Please reach out if I can be of any assistance in the future or as your plans continue to evolve. Best of luck with next steps!
Kind Regards,
Greg