The timing, when available, were in the functional specifications.
IBM stopped publishing instruction timings when they started getting so variable. Instrucion Pipelining, processor cache, and many other factors affect the time of a given instruction, so it is no longer possible to calculate a meaningful time for an instruction.
IBM does have unpublished tables for the number of cycles that a given instruction takes, assuming that it is not delayed by any of the miriad of factors.
You may want to check the Share presentations for some of Bob Rogers' excellent explanations, such as "What you do if you are a CPU" (may not be the exact title, it is buried on my desk somewhere).
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