As of today, there is only 1 major telco in Malaysia have yet to roll out 5G services which is Maxis. Today DiGi turning on 5G only for some of the postpaid plan (not including the one I subscribe).
I on the other hand subscribe UNIFI Mobile #Bebas Prepaid with 30-day free unlimited 5G data pass. Hence, I able to perform 5G Speed Test around Shah Alam area few days back.
Get 5G SIM card here