It is most likely pretty close to the final strain, viral mutations are optimizing for high transmission and low severity (to not kill the host and maximize infections) and this one is pretty close to the global maximum.
The selection pressure that sometimes selects for weaker strains is large amounts of viral hosts dying, causing the stronger strains to literally die out in the corpses they create.
People aren't dying in droves because of COVID. There is little evolutionary pressure to select for weaker variants of the virus.