Yes, if you have implemented google tag manager on your site there is no need of google analytics id. Because Google Tag Manager is capable of doing more things for you and it can track everything a user does on your site. once the GTM container is inserted on your site you can connect google analytics using tag manager to view reports. Learn how to connect google analytics using google tag manager.
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Moving to https changes required in google analytics
If you have already migrated to https, here are few required things to update in google analytics for getting accurate data.
Using Custom Segments in Google Analytics
Segments are subsets of your analytics data. Learn how to add, remove, share and import custom segments in google analytics.
How to check account activity in Google Tag Manager?
Here is how to view account activity in tag manager to see which activities have been done on the account since the account is created.