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Ordinarily, taking your pace for a leg of a rep session isn't going to give you a sensible baseline for the rest of your training.
But, seeing as you look like you spanked yourself in the first leg, you can probably treat it as a standalone race-pace session, and use it as a bench mark.
If you plug that into one of the training pace calculating spreadsheets, it suggests that you are currently around a 42:45 10k or 20:30 5k*
The idea then is to use that baseline to set your interval & threshold paces (for example, Daniels Tables gives paces of 4:43 /km threshold and 4:02 m/km interval)
* Assuming you have the base miles in your legs for those distances
Why wait?
A parkrun this Saturday* will give you a good baseline.
You're fit, and not a stranger to running, so a 5k race isn't likely to do you any harm.
* Or 5k at race pace this evening.