I doubt it. Their focus is on 5G. And their 4G offering is so saturated it can't even deliver the promised speeds for the standard packages, let alone a "high tier". For reference, when I was on their 4G i could get above 40mbps (on the "up to 10mbps plan") at 3am when there is little network saturation. In daytime this dropped to a few mbps. There is no speed cap on rain's 4G, it's just "you get what you get", which is usually poor.
Their 5G offering has been decent however, so far (on the Basic plan). Apart from the lack of backup power on 5G which makes having a UPS for my router useless...