If myths are to be believed, is Kalki Avatara coming for us?

Dashavatara are the ten incarnations of Vishnu, who is believed to be the preserver and protector of humanity, whenever Adharma (sin) is on power without control. From Satya Yuga to Kali Yuga, in either animal or human form, to save mankind from the increasing evil and to restore faith, he incarnates himself. Along with Brahma and Shiva, Vishnu forms the principal trinity of Hindu religious practice. Though there are two different types of Avataras- 

Sakshaty-Avatara: It means when Lord Vishnu descends himself on earth like Lord Krishna, Lord Rama. It is also sub-categorized into two parts-

1. Purna Avatara- All qualities of Vishnu are expressed, like Lord Krishna, Lord Narasimha, Lord Rama.
2. Amsarup Avatara- Lord Vishnu takes form directly, but he is manifested partially like Matsya, Kurma, Varaha.

Avesa-Avatara: When he indirectly empowers some living entity to represent him, like Parashurama, Vyasa, Buddha.

                                              According to Srimad Bhagavatam, there are innumerable incarnations of Lord Vishnu, and 24 Avatars of Vishnu are mentioned in the chapter. The most popular ten avatars based on many puranas are Matsya, Kurma, Varaha, Narasimha, Vamana, Parashurama, Rama, Krishna, Buddha, and Kalki.

Satya Yuga Avatara

• Matsya (The Fish): Matsya is the half-fish & half-human form of Vishnu who warned Manu, the leader of humans, of the great flood and ordered him to preserve all the grains, the Vedas and the living creatures in a ship. 
• Kurma (The Tortoise): Kurma is the half tortoise & half-human form of Vishnu who balances mount Mandara on his shell to assist the Gods and demons in churning the Ocean of Milk to get Amrita with serpent Vasuki as the rope.
• Varaha (The Boar): Varaha is the half boar & half-human form of Vishnu who slays the demon Hiranyaksha to save Bhudevi, the personification of the earth, and restores her back in the universe, from a sinking state using his tusks.
• Narsimha (The Man-Lion): Narsimha is the half-lion & half-human form of Vishnu, who killed arrogant demon Hiranya Kashyap, father of Prahlada and established peace, order and dharma on earth.

Treta Yuga Avatara

• Vamana (The Dwarf): Vamana the dwarf brahmin was the incarnation of Vishnu, to save the world from the demon king Mahabali, the grandson of Prahlada who ruled the universe. Though Vamana tricks him during a sacrificing ceremony and sends him to the netherworld.
• Parashurama (The Angry Man): Parashurama is the first Brahmin-Kshatriya with an axe in his hand who took a vow to end the tyranny of the evil Kshatriyas for the twenty-one times over, who misused their powers and made others’ lives miserable. He is one of the seven immortals mentioned in the scriptures.
• Rama (The Supreme Man): The Prince and King of Ayodhya is the Avatar of Morality and Rules. He is the lead character of the epic "Ramayana" who kills the evil king Ravana to end his demonic rule and to free his wife Sita, whom Ravana had kidnapped.

Dwapara Yuga Avatara

• Krishna (The Divine Statesman): Krishna was the eighth son of Devaki and Vasudev, from the Dwapara Yuga who killed his maternal uncle Kansa. Krishna is usually depicted with a flute in his hand and he is also the charioteer and guide of Arjuna in “Mahabharata”.

Kali Yuga Avatara

• Buddha (The Enlightened Soul): In Srimad Bhagavatam, it is said, Buddha avatar is the incarnation of Lord Vishnu. Siddhartha Gautam, later to be known as Gautam Buddha, left his family and all material possession in search of enlightenment. He founded Buddhism and taught people ways to end all kinds of suffering through Noble Eightfold Paths and also spoke about the path of Ahimsa (non-violence).

• Kalki (The Mighty Warrior): Kalki will be the final incarnation of Lord Vishnu, who will appear at the end of Kali Yuga. He will end all evil by defeating the demon Kali and start a new Yuga. Kalki is depicted as a warrior riding a white horse, holding a shining sword and blazing like a comet. Kalki is believed to arrive on earth, during the month of Baisakha, on the twelfth day after the full moon.