104 MB at the moment. For me at least, Slack really got their shit together sometime last year and improved the issue significantly. I still remember having to restart Slack twice a day, but it ain't issue anymore.
Would probably help to say how many slack organizations you’re using. I’m on around 6, and Slack almost always takes up a big chunk of memory. I suspect those with less resource usage are in fewer orgs, but it’s hard to say.
Over a gigabyte - never used more than a single organization. Gave up, the in-browser version has all the features the webkit-wrapper version has and is tamed well by the browser itself.
Continuing the anecdata collection, I'm in the over 1GB club. One instance of Slack, six of Slack Helper, several of which using 200GB of memory, but the biggest being 1GB. Timely thread, since when I sat down this morning and unlocked my computer, I was warned that I'd run out of memory and needed to quit some apps.
I really, really hope you mean "200MB", although I honestly wouldn't be surprised if they managed to use 200GB if accidentally started on a beefy server.