Some thoughts.
Apes and monkey’s do have vocal responses to identity, food and danger. some can also read sign language.
Monkeys process tails because they live in trees, apes do not have tails and are not as agile as the monkeys.
Originally we lived in trees, then with land clearing and of millions of years of not being in trees, our ancestors sat on their bums and of millions of years sitting around, being on flat ground, sitting on our bums around camp fires it slowly retreated
With so much time on out hands and so much time sitting around looking at each other we developed speech out of the same basic vocalisations for identity, food and danger as the monkeys and apes.
identify has self
ancient people started pointing to each other then vocalisations became an ancient form and start of names
food needs
started with pointing to mouth and stomach and vocalisations for basic food.
danger
started with pointing and vocalisations for danger
and then vocalisations developed for other needs
IMO the monkeys and apes will probably develop speech, just a question of which species and when, it may take hundreds of thousands of years or millions of years or it might happen sooner, who knows, but it probably will happen at some point.
Other animals have shown signs of speech recognition, whales, dolphins, horses, dogs…..