You can transplant now, though the later in fall someone waits (say, late October or into November), the more risk there is of winter damage (even if that damage doesn't manifest until early spring, which can lead to a false impression of success). Roots need time to re-establish, and while they can grow in cool soil even once frosts begin above-ground, eventually growth will slow or pause as the soil surface starts to freeze, and root establishment is important for evergreens in particular so they have access to non-frozen water below the soil surface to keep the foliage hydrated during winter. A good mulch application of about 2 to 3 inches depth applied after planting can help to insulate the soil a bit from temperature fluctuations and it can also reduce evaporation after rain or watering. (Don't pile mulch up against the trunk or main stems.) Keep an eye on a new (or relocated) plant's watering needs, even during late fall and mild spells in winter. By digging as large of a root ball as is manageable (more so in width than depth), you'll reduce the root loss from transplanting (though some root loss is inevitable) in order to reduce transplant shock and to accelerate re-establishment.

Miri

You're welcome!