Power wise you'll be fine, but your CPU is a bit on the slow side, being about as fast as a modern Ryzen 3400g, which isn't that fast, and Vega56 itself isn't that great of a choice anymore given the RTX 2060 is faster, quieter, and cheaper than any Vega 56 card, even reference editions.
Personally I would wait until AMD fleshes out the rest of the Ryzen 3000 series and Navi 5000 lines, which may be as soon as next month, and upgrade your entire system, and see where prices settle for Black Friday/Cyber Monday and the holidays.