Hey guys, I have a question. I have currently recorded a speed run of a Android game but it doesn't show the time. Any ideas on how I can add it so I can show proof?

Transfer the video to your computer, load it into a video editor, and use the time stamps. If the game mods require the time to be visible throughout the video, then ask if you can screen cap the starting and ending times from your video editor, as well. That seems reasonable to me, but you never know how strict a mod might be.

You can also play the video while using a timer on-screen and record your monitor with OBS or a similar software.

I used this app in a mobile speedrun once: https://play.google.com/store/apps/details?id=de.jentsch.floatingstopwatch&hl=en It's quite good. For your future runs of course though