Hmm… I’ve never really thought about the correspondences of an olive or olive tree in magick 
The one thing that immediately comes to my mind is the phrase “olive branch” in terms of arguments and disagreements. You know, the one about extending an olive branch – I think it comes from the Bible, that I know of. In this case, I would imagine anything relating to olives would have to do with peace and overcoming challenges.
So, I did some digging… 
(and I also didn’t know we had an olive emoji lol) and here’s what I found from various sources online!
Correspondences
Planetary: Mercury, Moon, Sun
Zodiac: Aquarius, Aries, Leo
Gender: Masculine
Element: Air, Earth, Fire, Water
Powers: Healing, Fertility, Potency, Fidelity, Protection, Immortality, Prosperity, Success
Deity: Amaterasu, Athena, Apollo, Minerva, Ra, Pele, Zeus, Horus, Hercules
Folk Names: Olivier, Itm, Mitan
Draw a pentagram in olive oil on an item you would like to protect.
Wear olive leaves to bring good luck
Hang branches over the door to prevent lightning strikes and keep evil from entering, or place the leaves in a bag or add them to a wreath and hang on the door or the chimney for the same purpose
Steep olive leaves in rainwater and asperge your house after you’ve cleaned and blessed it, or stash leaves in the corners of a room to keep a peaceful household and prevent or bring an end to family arguments.
Wear a wreath of olive leaves to ensure female fertility.
Eat olives to ensure male fertility and potency.
Use olive leaves to decorate an altar in honor of a God or honored ancestor.
Use olives and olive oil as offerings to Gods and honored ancestors
Olive oil is an excellent base for any oil blends and anointing oils, but note that its distinctive fragrance will be quite noticeable in your blend.
Write Athena’s name on an olive leaf and press it to your forehead to make a headache go away.
Olive Correspondences
Gender: Masculine
Planet: Sun
Element: Fire
Gods: Athena, Apollo, Eirene, Minerva, Ra, Concordia
I’m never going to look at olives the same ever again lol