In Safari 14 the new Start Page replaces Top Sites. The Start Page has several sections, including your Favorites, Frequently Visited sites and more. You can customize the Start Page to act much like the old Top Sites page, while also including your Reading List and iCloud Tabs pages.
News & Notes: Public Betas of macOS Big Sur and iOS 14 Now Available
News & Notes: Apple Releases New 27-Inch iMac Model