After gameplay I retimed this run using https://somewes.com/frame-count/ with a console FPS of 59.727500569606 which is the GB native framerate according to http://tasvideos.org/PlatformFramerates.html and raw video framerate of 30 FPS for a total of 7552 frames or a Console Time of 4:11.727. First Frame set when Mario and Yoshi move and End Frame set on the frame the Stage Clear message appears.

I use mGBA 0.8.4 with "Yoshi no Cookie.gb" ROM and a Retroflag USB controller.

Mod note: retimed to 4:11.727