Hi @amber_8798
I wrote out a long answer, but I realize I may have misunderstood.
Is Arial® by Monotype available to you in Photoshop or is is altogether missing? Here is the list of typefaces included with macOS and Arial is on the list: https://support.apple.com/en-us/108939.
If it is available, you will need to select your text and apply Arial for the Type face. It is a character setting, so the characters must be selected first.
Jane
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