That depends on severity of the problem… You can slow the spread by removing most infested parts hoping that they won’t spread to all plants.
It there are not many spider mites then predators would be best…
In final blooming stage (you are one or two weeks to go) I would not personally recommend spraying anything on the buds (it can be dangerous to smoke it). I’d maybe harvest them earlier…
There is also a lot of info in OG GrowFAQ just use search in upper right corner… For example: