How to mark Topic or Notification as "Read = true"

You gotta read it carefully.

Right clicking a request to timings and selecting copy a cURL will give you all you need for a request using the cURL syntax (the standard format for most people):

curl 'https://meta.discourse.org/topics/timings'  \
    -H 'Accept: */*' \
    -H 'Accept-Language: en-US,en;q=0.5'  \
    -H 'X-CSRF-Token: LONGTOKENHERE' \
    -H 'Content-Type: application/x-www-form-urlencoded; charset=UTF-8' \
    -H 'X-SILENCE-LOGGER: true' \
    -H 'Discourse-Logged-In: true' \
    -H 'Discourse-Visible: true' \
    -H 'X-Requested-With: XMLHttpRequest'  \
    --data 'timings%5B3%5D=1019&timings%5B4%5D=1019&topic_time=1019&topic_id=108685' \
    --compressed