@user64742 I agree, and that is actually also the standard SE guideline. Ultimately synonyms should be either merged or canceled. But it can make sense to have an evaluation-period.
When you said that the tags should be eventually merged, did you mean that the two tags are merged and the synonym is still left in place or that they are merged and the synonym is removed?
I certainly have no objection to merging if the synonym is established enough so that it's rather unlikely that somebody might suggest removal of the synonym.
As of January 16, 2020, all questions and answers have a “timeline button” underneath the voting buttons. Clicking on the clock icon directly leads to the timeline for that question or answer:
For more information, see the announcement Add a link to the timeline of a post on Meta Stack Exchange.
wikismeta The corresponding tag-info probably deserves some update after this.