First day of freedom for your hens
When they are first let out you may need to encourage them in as darkness falls (or if it rains) and tempt them out again in the morning. As they have been in artificial light for up to 18 hours a day, it takes them a couple of days to get the hang of things! Very often the hens will sleep on the floor of the house initially, but colony hens who have had access to low perches and generally have reasonable leg strength, so will soon learn to perch confidently. Free-range and barn hens will not have any problem perching.