Former Nikon user here -- Nikon has had major supply issues before too -- D850 comes to mind as one that took over a year to satisfy demand. More recently the Z9 took the better part of a year and before that the Z7 II took several months, though the...
No one knows the wait time -- even Canon USA, but it will feel like forever and a day. At this point it's pointless pre-ordering because by the time a lens is available for your preorder it probably will be generally available anyway. So why clog up ...