I entered the US on a F-1 visa several years ago. Whilst on OPT, my employer submitted a I-129 Petition for Change of Status to E-3, for which I am the beneficiary.
I was recently notified that my case was approved(!), and expect to soon receive a I-797A with a new I-94 with validity period corresponding to the period on my LCA.
Visa Type/Class
Now, keeping in mind that "status" is a separate from a visa (i.e. see this answer for example), what is the class of my existing visa after my status was changed from F-1 to E-3?

In my case, my visa stamp says
Visa Type/Class
R F-1
How would you refer to my current visa, after a change of status, before the visa expires? Here's my best guess as to how one might describe my current document:
It's a visa that permits entry to the US under F-1 status until mm/dd/yyyy.
Is this correct?