The Covid vaccines will be ready for rollout in 10 days from the emergency use authorisation date based on feedback from the dry run, the government said today, ending speculation about the time frame that started since the drug regulator's approval on Sunday; the centre has rolled out the co-WIN mobile application to be used for vaccination against the coronavirus; UK Prime Minister Boris Johnson cancels India visit because of the coronavirus situation; The Supreme Court has cleared the Central Vista Project; Another Trinamool leader quits the party; and other top news of the day.