I'd join.
Sent them a check 3 weeks ago and I haven't received it in my account yet. Contacted support and they said there's a backlog and they pretty much that they'll get around to it eventually

My first personal checks took over two weeks. I would give them 10 days after the money has been pulled from your bank account, then start to apply some pressure though the help ticket system. If 20 days went by after they pulled the funds from my bank account, then I would start to worry (and be a little pissed).