The easiest way is to review the startup messages that appear when you startup CA SMR. You should see something like this:
SMR001I - SMR ACTIVE VERSION 3.4 GENLEVEL 0309
Another method is to browse the CA SMR CAILIB member CAPLRLSE. Look for this character string:
CAPLRLSERELEASE 3.4 .340309CPL00.
You may have to tab over to the right a couple of screens if using standard ISPF screens (PF11).
To list out all the current PTFs APPLYd to your current level of CA SMR you can use the following JCL and SMPE control statements to create a report. This is not only handy for your own records but helpful should you open a support issue for any reason.
//LIST EXEC PGM=GIMSMP,REGION=4M,
//PARM='CSI=YOUR.SMR CSI GOES HERE' ----> change this
//SMPHOLD DD *
//SMPLOG DD SYSOUT=*
//SMPRPT DD SYSOUT=*
//SMPOUT DD SYSOUT=*
//SMPLIST DD SYSOUT=*
//SYSPRINT DD SYSOUT=*
//SMPCNTL DD *