I would support the advice of an iCloud or iTunes backup. Through numerous updates of iDevices on my part, those that restored (should you need to go that route) from an iCloud backup did so flawlessly. Everything looked as it did prior to the restoration, including bookmarks.
On a Mac since 1984.
Currently: 27" iMacs, Macbook Air, macOS 10.14.x,; iPhones, iPods and iPads galore!