Nothing is a guarantee, but it increases the odds of earning more money if that’s your goal. See this article, https://www.nytimes.com/interactive/2017/01/18/upshot/some-colleges-have-more-students-from-the-top-1-percent-than-the-bottom-60.html, and the research it was based on http://www.equality-of-opportunity.org/documents/.
The study is robust because of its large sample size of 6.7 million college students in their main sample, being able to match the data to IRS and W2 records to avoid biases inherent in income surveys, and following incomes longitudinally over many years, instead of looking only at the beginning of the career like the College Scorecard. The study is interesting in that it looks at income success: the probability of being in the top 1% or top 20% given you came from a family in the bottom 20%. The students who benefit the most from going to an Ivy Plus college seem to be the low income students. Like all studies, it has its limitations. Look at some of the debates on the Krueger studies and form an opinion.