Re-Tread should only be done on flat bed tyres like Trucks & Buses, as its heavy weight and moderate speed wont generate much risk.
In your case these tyres can still run 5000 [7000 in worst case]. But be aware that don't try to over speed or sharp turns at good speed, tyre my tend to loose grip on roads.
Since you said that you are little tight on budget, so there is little work around, to reduce the tyre pressure by 3 - 5 psi to get more grip; it will reduce the chance of slipping of tyre by some %. But still the risk remains!!.
Also if this would have happen 2 -3 months back the risk was little less, as with the next 1 month the rain will start and will create more problems on concrete/tarmac roads.
Get them replace as soon as possible.
If you are looking for new tyres go for Michelin Latitude Cross
you can upgrade tyres from stock to 255/65R16
if you have steel rims or 255/65R16
if you have alloys.