If you want to see the list of all the SNS topics that you have created under your AWS Account, you can do that using the aws cli command - aws sns list-topics
Let's take a look at an example.
% aws sns list-topics
-----------------------------------------------------
| ListTopics |
+---------------------------------------------------+
|| Topics ||
|+-------------------------------------------------+|
|| TopicArn ||
|+-------------------------------------------------+|
|| arn:aws:sns:us-east-1:10xx189xx953:apiTopic ||
|| arn:aws:sns:us-east-1:107xx89xx953:emailTopic ||
|| arn:aws:sns:us-east-1:107xx89xx953:smsTopic ||
|+-------------------------------------------------+|
As you can see I have three topics created.

Related Article:
How to create SNS Topic via AWS CLI Command: https://code2care.org/howto/create-aws-sns-topic-using-aws-cli
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