Determining correct firmware update

I am planning on upgrading the memory on my G3 tray loading iMac333. Over the years, I have upgraded through OS X versions 10.1, 10.2 and have been running under 10.3.9 for quite some time. I never knew about Firmware.
In looking at the discussions, they advise that I check the firmware version - the recommended updated version for this iMac being 1.2. When I startup the iMac in Open firmware, it states that it is Apple Open Firmware version 3.0f3.
The Hardware Overview from System Profile indicates:
Machine Model: iMac
CPU Type: PowerPC 750 (2.2)
Number Of CPUs: 1
CPU Speed: 333 MHz
L2 Cache (per CPU): 512 KB
Memory: 160 MB
Bus Speed: 67 MHz
Boot ROM Version: 1.3.f3
I am confused as to what this means and what version of firmware is actually installed. Have I been running under the incorrect version and is it recommended that I install Version 1.2 or not at this point? If so, what is the correct procedure to follow?

Also if you get a paper clip and push the programer hole in the side of the computer as it boots that would show as well if it was up to date.

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