I'm not sure what you mean by [infinity]n, so I'm going to propose a few models and we can discuss them.
Usually when we talk about different infinities we are talking about the cardinalities of some infinite set. We start with all Natural numbers [1, 2, 3, ...] and we know there's infinitely many of them [inf]Nat. We compare that against a set that only contains even numbers [2, 4, 6, ...] and our instincts say this should have 1/2 the cardinality of [inf]Nat, but it turns out that for every element in [inf]Nat there's a matching element in [inf]Even.[inf]Even[k] = 2*[inf]Nat[k]. So the cardinalities are exactly the same. This is expressed as Aleph0. (Hebrew - for when your math exceeds Greek notation). Similarly, sets of odds, squares, and primes all have this same cardinality. Even the set of all rationals (Natural + fractions) have this same cardinality. It's all Aleph0. The set of all irrationals, on the other hand, does not map back to the set of Natural numbers so it has a different Aleph (I couldn't tell you what it is, as I've reached the limit of my knowledge on this subject) as does the set of all Reals which subsumes it.
A models come from this knowledge. First, we can say that when you say infinity you really mean Aleph0, infiinity2 is Aleph1, and so on. In this case I'm not sure what infiintyinfinity means. This model suggests that Telestial progress is unbounded as far as formal limits go, but vastly smaller than any others. I'm unfamiliar with other Alephs so I can't add anything further here.
Second, we could say that when you say infinity, you mean the infinity of a specific infinite set. We'll say that's [inf]Even and infiinty2 is [inf]Nat and infinity3 is [inf]Rational.Additionally, we'll say infinityinfinity is [inf]Real. Again, the implication is that Telestial progress is infinite, but now each kingdom's elements (or experiences, or achievements, or glory) is a subset of the kingdom above it. Additionally, this shows some commonality between the first three (all are countably infinite) and a special state of the highest degree (uncountably infinite). If you want to bring immortality and eternal life into the discussion it would work well. An additional implication is that the lower kingdoms move "faster" than the higher. The kth even element when charted on a number line is farther along than the kth natural which is farther along than the kth rational and so on. You can tease some meaning out of that, but don't know how relevant it would be.
A third way we could view it (similar to the 2nd in implications) that lines up more with what you cited to McConkie is to use a number graph. Every degree adds another axis. The x-axis (Telestial) progresses infinitely, and go move along however fast or slow you want it to. But it never enters the y-axis (Terrestrial). y=0. Always. But that's okay, because x- knows nothing of y. A 2-D graph is quite literally infinity2 so it matches up with your naming convention. The Celestial then is 3-D. The advantage of this model is that it's probably more approachable to the (mathematically) lay person than the others. For the highest degree of the Celestial Kingdom I would perhaps model it as having Dimensions upon Dimensions added upon it because, as God offers another Dimension the Celestial person never says no.
The next 2 don't apply to your model but I mention them just for completion.
A fourth way that your modeling is contrasting (but which I'm going to include since that's the one sometimes used for this discussion so it gives a baseline to the discussion) is asymptotic progression. In this one you can view the positive quadrant for
and then just change that first 1 value for Kingdom Max. The first 3 all have some max that is ever approached but never reached, while Exaltation is not asymptotic.
A fifth model which this stands in contrast with is the one that seems to come to mind simply because of math ignorance. It has Telestial = x, Terrestrial = x2, and Celestial = x3, (and maybe Exaltation is nx?). These are unbounded, but their differences are simply the rate of progression.