Roadmap Solana need information

Sup, guys!
Im doing a research about Solana. Its difficult for me to find a roadmap. Can you help with it?
I need such information as (whats done and whatll be done)
2018 - launching whitepaper
2019 ???
2020 - launching public beta
2020 Q2 - binance private launching
2021 - ???
2022 ???
2023 and more in future??