I have done that a few times and I feel the value drops to almost zero, or in some instances even negative, by doing this.
Standups should be short hence do them standing with no digital screens around and team-size is optimally ~5. 30-60 secs per person probably. Writing a line on Slack spreads them out and takes away more focus IMHO.
Many people will just ignore what is written in the Slack channel and you lose the advantage that everyone knows what is going on and can give feedback. Instant helping out or course correct does not happen.
You lose the team feeling a sense of the team making progress, it easily becomes each dev for themselves.
It often devolves into ticking a box and keeping up the appearance that you are on track, instead of quickly catching those potential situations. I have seen devs then get into terrible psychological pressure since they have over-reported in a way that is much harder in a real standup.
If you need to focus more I would prefer to just drop the daily standup completely once or twice a week.