No max, since expectingly when the game releases you can buy more. 10 TP is the maximum amount until you stop gaining 1 TP every 2 hours. Any more TP needs to be bought, presumably.
TP’s name might be changed in the official release (probably back to NXP on the KR Servers.) Also, the pricings of things might change for the official release.
Currently on kTest, I have about 6k TP as it was given out by the Devs for us to test various TP features.