You don't have to update your sin while on implied status. It is automatically extended up to the time that you hear back from either of your applications. As soon as you hear back from them, you should update it.
The deductions will be the same as before, nothing changes.
You can check the processing of your BOWP application here:
https://www.canada.ca/en/immigration-refugees-citizenship/services/application/check-processing-times.html
As of April 28th, the processing time was 97 days and they were working on file received on Jan 20th. Depending on when you applied, you can guess when they are going to process yours.