I wish I had experience to share, but I just wanted to say I'm so proud of you for working towards this! I haven't come out to anyone at work yet, but worry about the possible backlash (very much a boys club)
You're an inspiration and you got this girl! So glad to hear your workplace has been supportive!
On Slack, is there anyone who wouldn't know who you were once the name change goes into affect? Maybe you can post in a thread everyone is included in and just briefly introduce yourself with your new name and if anyone has questions they can privately message you? Might help mitigate any possible confusion.
Agreed with my leadership that I'd put a quick heads up on Slack today in my team channel that my name has changed to avoid surprising anyone Monday, and to give the weekend for anyone to digest.
Response was positive so here's hoping no issues as work goes next week.