The money will reach your Groww Balance immediately. 
As per SEBI regulations, only 80% of the delivery sell amount is made available to invest within half an hour after the sell transaction, while the remaining 20% will be added to your Groww balance and made available to invest by the end of the day. 

You will be able to withdraw the whole sell amount after 10 AM on T+1 day i.e on the next settlement day.