Almost certainly this version (iOS 14.6) will be released by or before June 4, the last business day before WWDC 2021 starts and iOS 15 DP1 is released.
This seems certain, yes. However, ain't gonna be past them to do a 14.6.1 or 14.7 (they have a penchant for dot number increases since 2020) and then get to iOS 15.
I am waiting for iOS 15 at this point, though. I am reasonably sure iPhone 8 will handle it fine, and maybe next year or a year later I will upgrade both my phone and laptop together. Maybe. iPhone 7 and 8, along with MBA 2017 are taking iOS 14 and macOS Big Sur well, respectively. I expect them to take 2021's releases equally well. 2022, most likely not that well.