What do you call intro/end info on labels

I'm not fully getting the gist of the question I don't think. However, I'm going to take a guess and quote one of my old remix services, "Powerhouse" and see
if this is at least close. On a number of those discs was the bold claim of the tracks having exclusive "Riding 32 beats." Though I never in recent days have
seen anything like this come up in conversation, I've seen other services use 16, 32 and 64 beats in that way. I really don't know if there ever was a standard.

Working back in the radio business when our music was on
cartridges, that type of info would lead me to believe it
is a 7 second intro before the first vocal of the song
starts, the song has a run time of 2:49 and the type of
ending of the song is a fade out. Exactly as you had stated
in your first sentence.

But going back to the original question, of what do you actually call the notation of ":03/:10/2:47/C"?

I don't know.

I've never heard anyone describe the actual notation by a name or phrase.

It's just that thing that you write in china marker on the label of the promo 45 or the jewel box of the promo CD single.

It's pretty well standardized, for sure, but it doesn't have a name.

I always referred to them as "timing labels"

For those that never worked in radio, back in the days of playing
45's on the air I cut file folder labels in half and typed the tempo,
intro time(s), total time of the recording and the type of ending. I
placed the label at the top of the 45 generally covering the
record label logo so as to not to obscure the song title, artist,
songwriter or other label info.

Here's how I labeled them:

Tempo: two letters separated by a slash [/] as some songs
were not just slow, medium or fast. S/S, S/M, M/M, M/F, F/F

Intro: instrumental time before vocal begins. Might include
two numbers if there was more than one post to hit in the case
of a long instrumental intro. If the song began with a vocal and
without an instrumental intro it was designated as :00
underlined in bold type.

Total time: tracked each record with a timer to obtain
accurate time as many of the record labels contain incorrect
timing info. Needed an accurate time when backtiming to a
newscast or a hard break set for a specific exact time.

Ending: could be a fade, cold (definite ending) or a
cold/fade (definite ending but the final note(s) have a long
sustain) A definite but abrupt ending would be "cold" with an
exclamation point [COLD!]

Example of a label:

F/F    :09       2:35
                    FADE

File folder labels with different colors were used to designate
different categories for records. We used three colors for our
current rotations [high, medium, low] and another color for
recurrent. Prior to computer music scheduling records were
manually rotated within stacks from front to back so different
colors were necessary to designate their category.

Oldies had plain white timing labels with a second small sticker
designating their category by various letters [A, B, C, etc.]

When we transitioned to playing music from broadcast tape
cartridges the same designations were typed on the file folder
label placed on the edge of the tape cartridge.

At one station I worked at, we had the entire on-air library on 3x5 index cards and the pertinent info was on each card (the
station owner didn't want to deface the record labels). Of course, when I got there I added the relevant chart info
(including peak position), using my RR book. After you played the record, it was filed back in the library (A-Z by artist)
and the card was put at the end of the stack in the box that held the cards.