If we hear Hare Kṛṣṇa Hare Kṛṣṇa Kṛṣṇa Kṛṣṇa Hare Hare/Hare Rāma Hare Rāma Rāma Rāma Hare Hare, then śuddha-citta. Ceto-darpaṇa-mārjanam (CC Antya 20.12). The, the heart, the mirror of the heart, will be cleansed. And as soon as it is cleansed, we awaken, we remember, "Oh, I am eternal." Jīvera svarūpa haya nitya kṛṣṇa dāsa (Cc. Madhya 20.108-109). This remembrance comes, that "I am eternal servant of Kṛṣṇa." And when he understands that he's eternal servant of Kṛṣṇa and he engages himself in that service, then immediately he becomes liberated.
Liberation, mukti,... Mukti means to be situated in his own constitutional position. That is mukti. So our constitutional position is eternal servitorship of Kṛṣṇa. Caitanya Mahāprabhu has said, jīvera svarūpa haya nitya kṛṣṇera dāsa (Cc. Madhya 20.108-109). So if we can simply understand that "I am eternal servant of Kṛṣṇa. Let me again engage, be engaged in Kṛṣṇa's service," and if he's actually engaged, then immediately he's liberated. So devotees are already liberated. Those who are actually serious. Mukti svarūpeṇa vyavasthitiḥ (SB 2.10.6). Hitvā anyathā rūpaṁ svarūpeṇa vyavasthitiḥ. This is the definition of mukti.