During the Nintendo Direct, they announced that Gameboy and Gameboy Advance games will be available today for Nintendo Switch Online. The games available today are:

Game Boy

The Legend of Zelda: Link’s Awakening DX

Tetris

Super Mario Land 2

Gargoyle’s Quest

Game and Watch Gallery 3

Alone in the Dark: The New Nightmare

Metroid II: Return of Samus

Wario Land 3

Kirby’s Dream Land

Game Boy Advance

Super Mario Advance 4: Super Mario Bros. 3

WarioWare Inc

Kuru Kuru Kururin

Mario Kart Super Circuit

Mario & Luigi Superstar Saga

Zelda: Minish Cap

The following games will be added at a future date:

Zelda Rupee Chest Nintendo Switch Game Cases made by  DTCraftingCreations

Atomic Purple Nintendo Switch made by John Marcec

If you ever feel bad about yourself for taking too long on a project, just remember that when Pokemon was pitched to Nintendo in 1990, video games looked like this:

And when Pokemon was finally released worldwide, video games looked like this:

good things take time