Yes, you won't know about the height for another year or two.
Regarding records, they take a huge amount of time, but they have rewarded me time after time when I have need to go back. I have never regretted the time spent. And with computers, it so easy to organize/reorganize them!
I might share a simple abbreviated label system I have developed for my seedlings. This I use for
every seed lot I plant, not just lilies. They might be hybrid crosses, seed from the wild, the same seed from different sources, etc. Additional info is added if warranted, but space can be a premium on a short window blind.
This information is on every label:
Botanical Latin name
AAA-BB-CC
AAA = source of seed, often abbreviated, like a person's initials.
BB = the year of seed
collection, not when it was received.
CC = the year planted. An "F" might follow if it is fall planted.
Of course, complete information is on my computer.
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Sometimes I will "raid" the blinds cutting machine at Home Depot. The pieces in the throw away bin are often long enough to use as labels. Such is the label shown, and the rounded edge is already cut for you!