How do I know if my t4s have gone through. It says in progress but the last step I had was to return to file manager or something like that.

Filing

Do you mean that you want to know if your tax return has been sent? This FAQ shows how to find out if your return was filed using NETFILE and received by the CRA: https://turbotax.community.intuit.ca/community/tax-topics/help/how-do-i-know-if-my-return-was-filed-...