Display Post Modified Date Instead of Post Published Date

I want to display Post Modified Date Instead of Post Published Date in Google search results. I have already displayed the most modified date in a single blog post page. Still, I can see that Google display only the post published to date. I use Yoast in other blogs and it works fine with other blogs. But I moved to SEOPress for my new blog. This is the only problem I see with SEOPress. Please help me to sort it out.