Question Is this normal battery usage on a Oneplus 6t?

Your pic shows 3hrs 40mins screen usage since last charge, that's a lot of screen usage so 38% left sounds fine to me.
Also depends what you've been running on your phone since last charge -- some apps run battery down quicker than others (eg video playback is one).

I also see "Battery Saver" is turned off -- turning it on should help battery to last longer between charges.
 
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Your pic shows 3hrs 40mins screen usage since last charge, that's a lot of screen usage so 38% left sounds fine to me.
Also depends what you've been running on your phone since last charge -- some apps run battery down quicker than others (eg video playback is one).

I also see "Battery Saver" is turned off -- turning it on should help battery to last longer between charges.
Thank you alot I just was not sure