According to the HTML5Test benchmark which was spotted by LetsGoDigital, the Galaxy S10 Plus has the model number SM-G975F. This does tally with a previous leak. The S10 Plus benchmark seen here has a score 499 points out of 555 in the browser test.
That’s not all the Galaxy S10 Plus benchmark tells, it reveals that the display size is 412 x 869 pixels, which can be taken as 1440 x 3040 pixels resolution (if you multiply by 3.5). If the display size is 6.4-inches, that means the screen has a pixel density of 525 PPI at an aspect ratio of 19:9.
The Galaxy S10 Lite benchmark says that the phone has a display size of 360 × 760 pixels, which if we assume is a FullHD+ display, will support a screen resolution of 1080 x 2280 pixels. The PPI based on the 5.80-inch screen size will be 435 PPI. The device has the model number SM-G970F.