cat /proc/cpuinfo gives me a bunch of copies of this (one per CPU core):

$ cat /proc/cpuinfo
processor       : 0                                                             
BogoMIPS        : 49.15                                                         
Features        : fp asimd evtstrm aes pmull sha1 sha2 crc32 atomics fphp asimdh
p cpuid asimdrdm jscvt fcma lrcpc dcpop sha3 sm3 sm4 asimddp sha512 sve asimdfhm
 dit uscat ilrcpc flagm sb paca pacg dcpodp sve2 sveaes svepmull svebitperm sves
ha3 svesm4 flagm2 frint svei8mm svebf16 i8mm bti mte mte3                       
CPU implementer : 0x41                                                          
CPU architecture: 8                                                             
CPU variant     : 0x1                                                         
CPU part        : 0xd46                                                         
CPU revision    : 1         

Not sure how "MTE3" relates to "EMTE"...