Well. Since KSP2 is planning to be released in 2022 that gives us the windows of January 1st to December 31st.
Now we can sorta reduce that by looking on what the KSP2 completed. It seems ground base colnies are alsmot donw, Kerbal textures, most parts (if not all), UI, Space Center, Explosions, and animations (if more please let me know). So maybe January 1st to July 5th.
And with Dev blogs and videos this slows us down. Take time to film the devs talking. So maybe January 1st to August 23rd.
So KSP2 should release in 2022 but we are assuming there are no hiccups in the way.