I want to get information so I can speedrun Minecraft for the first time but I need the in game time? How would I find that on MacOS?

You can just count the time of the run that its not of IGT (In Game Time) off cameras after the run, if there are no many much of course, at least for glitchless and cases like that, where practicaly what affect is the portals of nether/end and things like that If you play with glitchess, yeah, you need something; in all case, you can just use a livesplit and been pausing and starting again the timer if you have practice with that and if you have a good setup yeah

You can find IGT in your stats JSON file (~/Library/Application Support/minecraft/saves/<WORLD NAME>/stats/<YOUR UUID>.json on macOS) then find "minecraft:play_one_minute" or "stat.playOneMinute" value. It is time in Minecraft ticks (20 ticks = 1 second).

Okey, thats also realy exact timer There can be a fail of 0,03333333... seconds at 60 fps, but in all case nice yeah

I run on mac os, so I just run the igt timer file in terminal. The time will just show up perfectly too.