I think it is safe to say that it will be somewhat delayed but I think the real construction will all be done in 2022 (i.e. finished by late November not late September) and that the plantings will happen in spring 2023 (which is probably better anyway, though I defer to
@Northern Light on things horticultural and arboreal!!) The new TTC overhead may follow at end of 2022 or early in 2023 but that work really causes no problems as the new poles will all be there (hopefully in the correct locations!)
The real key w/transplanting trees is that you want them to be in a state of dormancy or low energy production.
So trees that bear nuts, fruits or cones in the fall should, ideally, not be planted in the fall at a point where they are maxing out their energy and don't have the reserves to handle a shock and having their roots heavily cut.
If the tree is very small, and doesn't yet bear nuts/fruits/cones, its less of an issue.
Elsewise, Maples and Elms are fine in fall, so are Basswoods, Dogwoods, Honey Locust, and while I wish the City wouldn't plant them, Ginkos and Kentucky Coffee Trees too.
I would generally avoid planting oaks, hickories, beech and conifer species in the fall if possible.
A fall planting doesn't automatically kill those more sensitive species, but there is certainly an elevated risk.
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A good list here from Penn State of species that strongly prefer spring planting:
There are a few tree species such as black gum, hornbeam, birch, beech, white oak, hickory, walnut, holly, and sweet gum that don’t transplant well in the fall. They tend to go dormant very late in the fall and cutting roots to transplant them is best left to early spring, before bud break.
Transplanting evergreens such as pine, spruce and fir in late fall can also be a problem and lead to winter injury or browning and foliar desiccation from dry winter winds. When planting evergreens in the fall it is extremely important to water them weekly until the ground freezes (which is often late December or sometimes January). An anti-desiccant (a waxy polymer) can also be sprayed on fall transplanted evergreens to help protect the needles from losing moisture during the dry winters.
Source:
https://extension.psu.edu/programs/...-is-great-time-for-planting-in-your-landscape
