Max number of MIMO layers in 5G NSA?

As 3GPP standard, SU max DL per UE is 8 layers.
But actually not any UE supports 8 layers now, I searched 8t8r ue on google but not found anything, max 4t4r.
As I check huawei 5g counters, counters about RI just have 1/2/3/4.