Yes, MP51.0087.B00 shouldn't be installed.It was the macOS 10.13.5 full installer with the bad MP51.0087.B00 firmware, if I remember correctly.
So I recommend deleting all copy's of that 10.13.5 installer for not accidentally installing the MP51.0087.B00 firmware in the future.
Mac Pro 5,1 recent firmware releases:
10.13 DP5 with MP51.0083.B00 with initial APFS support
10.13 DP6 with MP51.0084.B00 with APFS support
10.13.4 with MP51.0085.B00 (Mojave DP1/DP2/PB1/DP3/PB2 too)
10.13.5 with MP51.0087.B00 missing the Intel Xeon microcodes
10.13.6 with MP51.0089.B00 updating to the Spectre mitigated microcodes on the April 2 Microcode Update Guidance.
10.14 DP7/PB6 with 138.0.0.0.0 with 5GT/s and new microcodes
10.14.1 DP1 with 139.0.0.0.0
10.14.1 DP3 with 140.0.0.0.0 with NVMe support
10.14.4 DP2 with 141.0.0.0.0
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