Removing last Exchange server from on-prem

Hello,

I have a query about removing last Exchange server from our pn-prem.

I followed MS article: https://can01.safelinks.protection.outlook.com/?url=https%3A%2F%2Flearn.microsoft.com%2Fen-gb%2FExchange%2Fmanage-hybrid-exchange-recipients-with-management-tools&data=05%7C01%7Cbachar.bader%40innocap.com%7C59d6e6b3ff134e26153a08db89f0573f%7Cef371070d9ec492eb331b18ac7f8a103%7C0%7C0%7C638255437618994994%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=Lu5li48A9AlZZifzSn3lngdRU0Jh5%2BHBZjHZrTcxYss%3D&reserved=0

To remove the last Exchange server from on-prem while keeping Exchange online and AD connect to sync identity and properties from on-prem AD to Azure AD.

I completed the paragraph “Prepare the Exchange Environment”, that end with shutdown Exchange server. And now our Exchange server is turned off and everything works fine.

My question is: shall I continue with next paragraph of “Permanently shutting down your last Exchange Server” and “Active Directory clean up”. and if I do so, will this impact Sync Exchange properties of users from on-prem to cloud ?
Anyone did this before and is it safe ?
we are keeping our users in local AD synced to Azure AD using AD connect.