As per How to upgrade to macOS Mojave, under Check compatibility it says (my emphasis):

You can upgrade to macOS Mojave from OS X Mountain Lion or later on any of the following Mac models. Your Mac also needs at least 2GB of memory and 12.5GB of available storage space, or up to 18.5GB of storage space when upgrading from OS X Yosemite or earlier.

• MacBook introduced in early 2015 or later
• MacBook Air introduced in mid 2012 or later
• MacBook Pro introduced in mid 2012 or later
• Mac mini introduced in late 2012 or later
• iMac introduced in late 2012 or later
• iMac Pro (all models)
• Mac Pro introduced in late 2013, plus mid-2010 or mid-2012 models with a recommended Metal-capable graphics card.

I am currently running High Sierra on my Early 2011 MacBook Pro.

What does Apple's requirements mean for my ability to install Mojave?

  Is it possible or worthwhile?

As per Apple support document, How to upgrade to macOS Mojave:

1. Check compatibility

You can upgrade to macOS Mojave from OS X Mountain Lion or later on any of the following Mac models. Your Mac also needs at least 2GB of memory and 12.5GB of available storage space, or up to 18.5GB of storage space when upgrading from OS X Yosemite or earlier.

• MacBook introduced in early 2015 or later
• MacBook Air introduced in mid 2012 or later
• MacBook Pro introduced in mid 2012 or later
• Mac mini introduced in late 2012 or later
• iMac introduced in late 2012 or later
• iMac Pro (all models)
• Mac Pro introduced in late 2013, plus mid-2010 or mid-2012 models with a recommended Metal-capable graphics card.

I am currently running macOS High Sierra on my Early 2011 MacBook Pro.

What does Apple's requirements mean for my ability to install Mojave? Is it possible or worthwhile to do so?