All fresh herbs and plants are better gathered in the morning, once the dew has dried off, and preferably in early sun – their alkaloids are stronger (this is more releavnt to medicinal herbs however).
Use on pasta, with baked potatoes, on oatcakes, with nut-roast, veggie sausages etc. The oil means it'll keep a few days. Last night I cooked the Irish dish colcannon, which uses mashed potatoes (our own), with chopped raw onion and in our case the last of our kale. I dolloped the pesto on top.