At any given time, one knows how many vbytes of higher-paying transactions is already in the pool. One cannot know how many bytes will arrive in the future. The best one could do is estimate (model) based on historical data.

If it was me, I’d come up with threshold estimates. For example, statements like “to have a 50% chance of getting in within 10 blocks, you’d have to pay 101 sats/vbyte”.

Starting from this, you could make a table of estimates where one axis is the likelihood of getting in (50%, 75%, 90%, 95%, 99%) and the other axis is the number of blocks (1, 2, 5, 10, 20, 50). I each cell of the table, put the sats vbyte, then color code for visibility.

It would look something like this BMI chart, with curves of color. .jpeg