On Blu-ray, the show is presented in 1080p at 2.00:1 aspect ratio and DTS-HD Master Audio 5.1. On 4k Blu-ray, Chernobyl is presented at 2160p with HDR (High Dynamic Range). The 5-episode season has a total run time of 5 hours and 30 minutes. And, if the product listing is correct on Amazon we should be getting digital copies of the season with both disc releases.
Chernobyl on Blu-ray is selling for $19.99 (List: $59.99) while the DVD is priced $19.94 (List: $49.99). The 4k Blu-ray edition has a list price of $44.98. Order from Amazon.