It came with quite a bit of controversy a couple weeks ago thatWordPress 5.0 which includes the hotly controversial Gutenberg editor would be released the week of Thanksgiving.
This week another bit of hot news dropped. If you are planing on using the Classic Editor plugin, you officially have 3 years to fully make the switch to Gutenberg. That window is within several sites redesign cycle, but not all.
If you needed a hard conversion date, better make it before 2021.