From one friend which is working in agriculture, glyphosate was used before planting the crops, to remove invasive species. But it does not change the fact that it's toxic to humans.

Glyphosate is also used to get cereals to dry up faster once they've grown enough.

Doubtful. Glyphosate is one of the safest and most effective herbicides developed. If we develop alternatives to herbicides, such as GMOs or different growing methods, I can see that reaction to herbicides in general but not specifically glyphosate.