If I use OCLP on a 2015 iMac can I get it to update to latest OS and it be secure?

I need to know. Was about to throw the iMac away but a buddy mentioned this and will save me spending on a new iMac! I am concerned about security updates as I use my iMac for ordering online, banking etc so need it secure. Thank you.

submitted by /u/Mountain489
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