I think that unfortunately there won’t be a helicopter in FS2020 before the end of 2021 
. More likely to be in the middle of 2022, because the developers definitely need some time to be able to deliver the appropriate quality.
Furthermore, it is still unknown how big the content of the addon will be. I hope that not only will the helicopter models and helipads remain, but that there will also be realistic tasks for them
You can also visit my thread for suggestions for the addon
https://forums.flightsimulator.com/t/suggestions-for-the-planned-helicopter-add-on/236978/50