It depends on your goals but assuming a very high level of ability on guitar is desired, I believe a guitarist should continue to learn and expand their knowledge of chords continuously throughout their musical life. Time should be allocated to work on this area of guitar on a regular basis.

Chords should be applied in a musical way as soon as possible once they are learned so they are retained, but more importantly so they are useful. Depending on how the style of a guitarist develops, they will find they favor some chords more than others and will begin to know what which ones help them achieve the emotion and style they are looking for and which ones they don't really need or use.

They won't all be relevant so it is not necessary to be concerned about 'knowing all the chords' as there are limitless possibilities. Instead, be concerned about gradually building your chord vocabulary over time and finding ways to apply them as appropriate in your own music.