I feel like I'm in Heaven before my time

This is from an episode of a western show, but I don't know which one. It was right at the end after the resolution and it was just sort of a celebration because I guess they had a special musical guest on. Have you heard this song before? Here are the lyrics:

The river's flowing,
I can touch the sky,
And Mama's gonna make
Some apple pie.
I feel like I'm in Heaven before my time.

The sun is shining
And it's early Spring,
Whoops, there goes
An angel's wing.
I feel like I'm in Heaven before my time.

The sky is blue
And the grass is green,
Touch me so that
I know it ain't no dream,
'Cause I feel like I'm in Heaven before my time.

Well I mean to tell ya
It's a big surprise,
If this ain't Heaven,
It's a good disguise.
'Cause I feel like I'm in Heaven before my time.

The sun is shining
And it's early Spring,
Whoops, there goes
An angel's wing.
I feel like I'm in Heaven before my time.

Well I mean to tell ya
It's a big surprise,
If this ain't Heaven,
It's a good disguise.
'Cause I feel like I'm in Heaven before my time.
Hmm, I feel like I'm in Heaven before my time.
Yeah, I feel like I'm in Heaven before my time.