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Grapple’s effect of flipping exactly 4 different icons in battle and gains +4 attack and +4 defense says “until end of turn.” Does this mean the end of me attacking or my opponent? What I’m trying to know is if Grapple’s effect triggers, will he be able to defend with +4 defense?

Your turn ends after you are done attacking. If you trigger his ability when attacking, the defense would not carry over to your opponent’s turn and vice versa.
Source: Wizards of the Coast (2019-03-08)    【Link to Ruling】
Tags: Grapple, Autobot Architect