It is generally a good idea to update the immigration authorities about any changes in your personal circumstances, including changes in your marital status. This is important because your marital status can affect your immigration application, and failing to disclose changes in your personal circumstances can lead to problems with your application or even result in a denial of your application.
With that said, it is ultimately up to you to decide whether to apply for citizenship now as a single person or to wait until you are married to submit your application. If you decide to apply now as a single person, you should make sure to update the immigration authorities about your marital status as soon as possible after you get married. You can do this by submitting a Notice of Change of Address and Status form (IMM 5707), which can be found on the Government of Canada's website.
If you decide to wait until you are married to submit your application, you should make sure to have all of the required documentation and information ready to submit with your application when you are ready to apply. This will help to ensure that your application is processed smoothly and efficiently.
It is difficult to predict how long your application will take to be processed, as processing times can vary depending on a number of factors. You can check the current processing times for citizenship applications on the Government of Canada's website to get an idea of how long your application may take to be processed.
