Thats that are concerned in SID application, please refer to the recruitment process avail publicly.

1. Fill in form
2. Sit for suitability test in person or online
3. Attend Interview in person or online
4. Undergo security vetting
5. Receive an offer and start date

Common sense will tell you, if you went for interview and they are proceeding with security vetting, there is a very high chance for you to get offered unless something goes wrong with your security vetting. However this is not 100% and security checks on some other matters might be a consideration area which the organization might consider.

So for those whom are waiting for #3 attend interview and had completed it and processing to security vetting, you have a very high chance. But like many others shared, security vetting might take few months to complete.