Is it time to harvest?

Those are Spider mites, just look up a natural way to kill them, soak the plants, top to bottom leaves, with what ever you decide to use. Do it once a week until you are ready to harvest. it should give the plant a fighting chance.

Btw that’s not mildew. That’s damage from a bug. Likely a thrip or something along those lines.

No that’s not ready. Those aren’t brown from natural senescence. You can see only half the pistil is brown up top the bottom is white. That’s not natural end of life browning.

Yeah Clide, you're right, these leaves are all fucked up. It grows outdoors and I think there's not much I can do, right? How can I deal with it now? I'm from Brazil so using any special cannabis product is hardly possible.

Looks like you may have some powdery mildew to attend to first, sorry bud :( And for harvest readiness, it is generally better to look at the trichome development rather than the pistils-- especially for autos, as the pistils tend to darken a lot earlier. In terms of semi-harvest, you can do it but bear in mind that the plant requires some recovery time before it will finish the lower buds and so, that is far less ideal with autos.