The leaderboards in Infinite Warfare allow players to see where they rank in the top 10,000 in overall and in each mode. You can see your stats against friends or against all, with only top 10,000 shown. In addition, there’s the option to filter leaderboards by All Time, Monthly, and Weekly.
All stats since game launch are reflected on the Leaderboards. Players can see how the rank up in each mode or overall. On PC (leaderboards are not live yet on PC), players need at least 150 kills in each mode before their stats will show up on the individual game mode leaderboards.
Players can checkout the Leaderboards under the Barracks section in Call of Duty: Infinite Warfare MP.
SOURCE: Infinity Ward (Thanks @RATandNOOB for tip!)