Yeah, you can chop now or in a few days.
Wouldn't wait more than a week.
You can enhance the uplifting effect by harvesting more on the early side or more relaxing effects by harvesting later.
You wont have sativa effects from an indica if you chop early or indica effects from a sativa if you chop late.
It's only a slight change on what the genetics produce, not from rushy to couch lock.
For that reason I normally harvest my sativa leaners on the early side to enhance the uplifting effects, because that is what they do and harvest my indica plants on the later side.
Buying a sativa plant and trying to get couch lock effects is counterproductive, so use your harvest time to help the genetics because they have the biggest impact on the effect.
Harvest timing is just a cherry on top.