I'd go for another 2 days maybe, then try letting them out again. Ramp isn't steep so that shouldn't be much of an issue. During the day is it normally lit inside the coops at all, as I don't see any windows.They have completed 3 days of lockdown, plus about 3 hours. These are the coops - only up on cinder blocks so not high. The dark blue coop DOES have a ramp that isn't pictured, with rungs about every 6 inches.
Prior to lockdown, they would venture up the ramp but not actually enter the coop. No issues with them coming out in a semi orderly fashion once I removed the chicken door barricade.
I'd ask about ventilation too but to be honest I don't know how that's normally handled in arctic type climates.