For a few dollars 'Canadian' more, like just $20, I would just go the whole hog and get the RX 5700 XT!!!! And be happy ever more....The B450 Tomahawk is actually a good tried and tested motherboard so I see no issues here, just a BIOS update for the 3600...all else is good.
PCPartPicker Part List:
https://ca.pcpartpicker.com/list/kwnhD2
CPU: AMD Ryzen 5 3600 3.6 GHz 6-Core Processor ($264.50 @ Vuugo)
Motherboard: MSI B450 TOMAHAWK ATX AM4 Motherboard ($149.99 @ Memory Express)
Memory: G.Skill Ripjaws V Series 16 GB (2 x 8 GB) DDR4-3200 Memory ($101.99 @ Newegg Canada)
Storage: Intel 660p Series 1.02 TB M.2-2280 NVME Solid State Drive ($119.99 @ Canada Computers)
Storage: Seagate Barracuda 2 TB 3.5" 7200RPM Internal Hard Drive ($82.32 @ Vuugo)
Video Card: ASRock Radeon RX 5700 XT 8 GB Video Card ($518.50 @ Vuugo)
Case: Corsair SPEC-04 ATX Mid Tower Case ($74.50 @ Vuugo)
Power Supply: EVGA BR 600 W 80+ Bronze Certified ATX Power Supply ($82.99 @ PC-Canada)
Total: $1394.78
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2019-09-10 15:00 EDT-0400
IF you could stretch to the Seasonic Focus Plus Gold 600W at roughly a $110 Canadian, that would be good also but not key..