I don't want to hijack this tread, so I'll keep my response short.
And a trans Canada route appeals to me for 2019/20.
Is Vancouver still at one end?
Yes, Vancouver is a logical starting/ending point for riding across Canada. However, it is a big country! The entire Trans-Canada highway (Victoria, BC to St John's, Newfoundland) is 7,821 km (4,860 miles) long. At 100 km per day, that would be 78 riding days.
I think it's better to pick a region of the country, and tour there. Ideas are the Maritime provinces (Nova Scotia, Prince Edward Island, and New Brunswick), Quebec, Ontario (ask John Saxby on this forum -- he is in Ottawa), or BC (my favourite). My dream ride is to do the Kettle Valley Railway trail though BC. The KVR was opened in 1916 and closed in the 1950s, and much of it has been turned into a recreational gravel trail. It is through some of the most rugged and beautiful terrain in the world, especially the Coquihalla Canyon (200km east of Vancouver) and the Myra Canyon (near Kelowna, 400km east of Vancouver). The Coquihalla gets 40+ feet of snow each winter.
- DaveS