Last I checked the Vega 20 was deemed equivalent to between the GTX1050 and 1050Ti on notebookcheck.com. That ain't too great. It will be closer to a P2000 Quadro and far below the P3200, which is the best bang-for-buck Quadro.
Congratulations on the Thinkpad. I had the P51, which had some issues, so I hope they have been ironed out and that it is smooth sailing for you. I hope you don't mind me saying that the P53 release is imminent and is a complete redesign of the P52.