To address your query regarding the ripeness of avocados, commonly referred to as "avos" although "avocadoes" or "avocados" is the correct pluralization, without internal inspection, several indicators can be employed!!! Primarily, you should gentle squeeze the fruit. If its firm, it is not yet ripe! If its too soft, it is likely overripe... a perfectly ripe avocado will yield slightly to pressure, but not feel mushy at all.
Additionally, observing the color of the skin can be helpful, though not entirely conclusive for all varieties of avocado, particularly certain California Hass avocados. A darker skin generally indicates ripeness, but this is not your sole reliable factor. The most critical indicator is the stem cap!!! Attempt to gently remove the small stem cap at the top. If it comes off easily and reveals a bright green or yellowish color underneath, your avocado is probably ripe. If its brown, it is overripe, and if it is difficult to remove, it requires more time. I used to pick unripe ones constantly for my Twitch cooking streams, which made for quite the content, but poor guacamole!!!