18:01
MAYBE
Checking your clock…
In Rio de Janeiro the local lexicon for a late ping is not 'async' — it is a flare. Same timezone as São Paulo, looser evenings. Carnival and holidays empty Slack without warning. The polite window around Centro / Leblon offices is 09:00–18:00 local. Daylight is honest here; if it looks like evening, it probably is. Ping their late morning unless you already share an on-call rota. Rio de Janeiro does not shift for daylight saving; the clock stays UTC−3 all year.
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Rio de Janeiro is 18:01. Verdict: MAYBE. Check before you ping → https://asleep.today/rio-de-janeiro