def get_estimate_text(self, network: 'Network') -> str:
        """
        Description of the current fee estimate corresponding to the target
        """
        fee_per_kb = self.fee_per_kb(network)
        fee_per_byte = fee_per_kb/1000 if fee_per_kb is not None else None
        tooltip = ''
        if self.use_dynamic_estimates:
            if fee_per_byte is not None:
                tooltip = format_fee_satoshis(fee_per_byte) + f" {util.UI_UNIT_NAME_FEERATE_SAT_PER_VBYTE}"
        elif self.method == FeeMethod.FEERATE:
            assert fee_per_kb is not None
            assert fee_per_byte is not None
            if network and network.mempool_fees.has_data():
                depth = network.mempool_fees.fee_to_depth(fee_per_byte)
                tooltip = self.depth_tooltip(depth)
            if network and network.fee_estimates.has_data():
                eta = network.fee_estimates.fee_to_eta(fee_per_kb)
                tooltip += '\n' + self.eta_tooltip(eta)
        return tooltip

        Description of the current fee estimate corresponding to the target
        
electrum/fee_policy.py