When does Minecraft 1.16 come?
When it comes.
Give the developers time, they're just humans too.
In summer.
The snapshots have been outside for a few months. So you can play it for a long time
In the last snapshots mainly bugs were fixed and hardly any new things were added. One could assume that 1.16 is almost done. However, there were still pre-versions in 1.15 (e.g. 1.15pre-1), which are not yet available for 1.16.
There's a high possibility that 1.16 will be released in June or July